├── .gitignore ├── Chapter01 ├── 6.scala └── 7.scala ├── Chapter02 ├── 01.scala ├── 04.scala ├── 06.scala ├── 09.scala └── 10.scala ├── Chapter03 ├── 01.scala ├── 03.scala ├── 04.scala ├── 05.scala ├── 06.scala ├── 07.scala ├── 08.scala ├── 09.scala └── 10.scala ├── Chapter04 ├── 01.scala ├── 02.scala ├── 03.scala ├── 04.scala ├── 05.scala ├── 06.scala ├── 07.scala ├── 08.scala ├── 09.scala ├── 10.scala └── gpl.txt ├── Chapter05 ├── 01.scala ├── 02.scala ├── 03.scala ├── 04.scala ├── 05.scala ├── 06.scala ├── 07.scala ├── 08.scala └── 10.scala ├── Chapter06 ├── 01.scala ├── 02.scala ├── 03.scala ├── 04.scala ├── 05.scala ├── 06.scala ├── 07.scala └── 08.scala ├── Chapter07 ├── 03.scala ├── 06.scala └── 09.scala ├── Chapter08 ├── 01.scala ├── 02.scala ├── 03.scala ├── 04.scala ├── 05.scala ├── 06.scala ├── 07.scala ├── 08.scala └── 09.scala ├── Chapter09 ├── 01.scala ├── 01.txt ├── 02.scala ├── 02.txt ├── 03.scala ├── 03.txt ├── 04.scala ├── 04.txt ├── 05.scala ├── 06.scala ├── 06.txt ├── 07.scala ├── 07.txt ├── 08.scala ├── 09.scala └── 10.scala ├── Chapter10 ├── 01.scala ├── 02.scala ├── 04.scala ├── 05.scala ├── 07.scala ├── 08.scala ├── 08.txt ├── 09.scala ├── 10.scala └── 10.txt ├── Chapter11 ├── 03.scala ├── 04.scala ├── 05.scala ├── 06.scala ├── 07.scala ├── 08.scala ├── 09.scala └── 10.scala ├── Chapter12 ├── 01.scala ├── 02.scala ├── 03.scala ├── 04.scala ├── 05.scala ├── 06.scala ├── 07.scala ├── 08.scala ├── 09.scala └── 10.scala ├── Chapter13 ├── 01.scala ├── 02.scala ├── 03.scala ├── 04.scala ├── 05.scala ├── 06.scala ├── 07.scala ├── 08.scala ├── 10.scala └── 10.txt ├── Chapter14 ├── 02.scala ├── 03.scala ├── 04.scala ├── 05.scala ├── 06.scala ├── 07.scala ├── 08.scala ├── 09.scala └── 10.scala ├── Chapter15 └── 06.scala └── Chapter16 ├── 02.scala ├── 04.scala ├── 05.scala ├── 06.scala ├── 07.scala └── tagsoup-1.2.1.jar /.gitignore: -------------------------------------------------------------------------------- 1 | *.sublime* 2 | target/ 3 | *.class 4 | *.jar 5 | *.out 6 | -------------------------------------------------------------------------------- /Chapter01/6.scala: -------------------------------------------------------------------------------- 1 | import BigInt.probablePrime 2 | import util.Random 3 | 4 | println(probablePrime(100, Random)) 5 | -------------------------------------------------------------------------------- /Chapter01/7.scala: -------------------------------------------------------------------------------- 1 | println(BigInt(128, util.Random).toString(36)) 2 | 3 | -------------------------------------------------------------------------------- /Chapter02/01.scala: -------------------------------------------------------------------------------- 1 | def signum(n: Int) = { 2 | if (n > 0) 1 3 | else if (n < 0) -1 4 | else 0; 5 | } 6 | 7 | println(signum(5)); 8 | println(signum(-5)); 9 | println(signum(0)); -------------------------------------------------------------------------------- /Chapter02/04.scala: -------------------------------------------------------------------------------- 1 | def countdown(n: Int) = { 2 | for( i <- Range(n, 0, -1) ) 3 | println(i) 4 | } 5 | 6 | countdown(5); -------------------------------------------------------------------------------- /Chapter02/06.scala: -------------------------------------------------------------------------------- 1 | 2 | def prod(s: String) = { 3 | var res: Long = 1; 4 | for( ch <- s ) res *= ch.toLong 5 | res 6 | } 7 | 8 | 9 | println(prod("Hello")) 10 | println("Hello".foldLeft(1L)(_ * _.toLong)) -------------------------------------------------------------------------------- /Chapter02/09.scala: -------------------------------------------------------------------------------- 1 | def prod(s: String) : Long = { 2 | if (s.size > 0) 3 | prod(s.tail) * s.head.toLong 4 | else 5 | 1 6 | } 7 | 8 | println(prod("Hello")); -------------------------------------------------------------------------------- /Chapter02/10.scala: -------------------------------------------------------------------------------- 1 | def func(x: Double, n: Int): Double = { 2 | if (n == 0) 1 3 | else { 4 | if (n > 0) { 5 | if ( n % 2 == 0 && n > 2) { 6 | func(func(x, n/2), 2) 7 | } else { 8 | x * func(x, n - 1) 9 | } 10 | } else (1 / func(x, -n)) 11 | } 12 | } 13 | 14 | printf("2^2=%f\n", func(2, 2)); 15 | printf("10^9=%f\n", func(10, 9)); 16 | printf("3^3=%f\n", func(3, 3)); 17 | printf("2^-1=%f\n", func(2, -1)); 18 | printf("5^0=%f\n", func(5, 0)); -------------------------------------------------------------------------------- /Chapter03/01.scala: -------------------------------------------------------------------------------- 1 | import util.Random 2 | 3 | def randomArray(n: Int) = { 4 | val a = new Array[Int](n); 5 | for (i <- 0 until a.size) a(i) = Random.nextInt(n); 6 | a 7 | } 8 | 9 | println(randomArray(7).mkString("Array(", ", ", ")")) -------------------------------------------------------------------------------- /Chapter03/03.scala: -------------------------------------------------------------------------------- 1 | import util.Random 2 | 3 | def randomArray(n: Int) = { 4 | val a = new Array[Int](n); 5 | for (i <- 0 until a.size) a(i) = Random.nextInt(n); 6 | a 7 | } 8 | 9 | def swapAdj(a: Array[Int]) = { 10 | for(i <- 0 until a.size) 11 | yield if (i % 2 == 0) 12 | if (i < a.size-1) 13 | a(i+1) 14 | else 15 | a(i) 16 | else a(i-1) 17 | } 18 | 19 | val test = randomArray(9); 20 | val res = swapAdj(test); 21 | 22 | println(test.mkString("Array(", ", ", ")")) 23 | println(res.mkString("Array(", ", ", ")")) -------------------------------------------------------------------------------- /Chapter03/04.scala: -------------------------------------------------------------------------------- 1 | def positiveNegative(a: Array[Int]) = { 2 | a.filter(_ > 0) ++ a.filter(_ <= 0) 3 | } 4 | 5 | val test = Array(10, 7, -5, 11, -44, 0, 22, -22, -100, 77, -5); 6 | val res = positiveNegative(test) 7 | 8 | println(test.mkString("Array(", ", ", ")")) 9 | println(res.mkString("Array(", ", ", ")")) -------------------------------------------------------------------------------- /Chapter03/05.scala: -------------------------------------------------------------------------------- 1 | import util.Random 2 | 3 | def randomArray(n: Int) = { 4 | val a = new Array[Double](n); 5 | for (i <- 0 until a.size) a(i) = Random.nextDouble; 6 | a 7 | } 8 | 9 | def avg(a: Array[Double]) = a.sum / a.size; 10 | 11 | val test = randomArray(1000000); 12 | val res = avg(test); 13 | 14 | //println(test.mkString("Array(", ", ", ")")) 15 | println(res) -------------------------------------------------------------------------------- /Chapter03/06.scala: -------------------------------------------------------------------------------- 1 | import util.Random 2 | 3 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 4 | 5 | def randomArray(n: Int) = { 6 | val a = new Array[Int](n); 7 | for (i <- 0 until a.size) a(i) = Random.nextInt(n); 8 | a 9 | } 10 | 11 | val arr = randomArray(10); 12 | val buf = arr.toBuffer 13 | 14 | val sorted_arr = arr.sortWith(_ > _) 15 | val sorted_buf = buf.sorted.reverse 16 | 17 | prn(arr) 18 | prn(buf) 19 | prn(sorted_arr) 20 | prn(sorted_buf) 21 | -------------------------------------------------------------------------------- /Chapter03/07.scala: -------------------------------------------------------------------------------- 1 | import util.Random 2 | 3 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 4 | 5 | def randomArray(n: Int) = { 6 | val a = new Array[Int](n); 7 | for (i <- 0 until a.size) a(i) = Random.nextInt(n) 8 | a 9 | } 10 | 11 | val arr = randomArray(10) 12 | 13 | prn(arr) 14 | prn(arr.distinct) -------------------------------------------------------------------------------- /Chapter03/08.scala: -------------------------------------------------------------------------------- 1 | def randomArray(n: Int) = { 2 | val a = new Array[Int](n); 3 | for (i <- 0 until a.size) a(i) = util.Random.nextInt(n * 2) - n 4 | a 5 | } 6 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 7 | 8 | val arr = randomArray(10).toBuffer 9 | 10 | prn(arr) 11 | 12 | val indexes = ( for(i <- 0 until arr.size; if (arr(i) < 0)) yield i).reverse.dropRight(1).foreach(arr.remove(_)) 13 | 14 | prn(arr) -------------------------------------------------------------------------------- /Chapter03/09.scala: -------------------------------------------------------------------------------- 1 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 2 | 3 | val zones = java.util.TimeZone.getAvailableIDs 4 | 5 | val american = zones.filter(_.startsWith("America/")).map(_.drop("America/".size)) 6 | 7 | prn(american) -------------------------------------------------------------------------------- /Chapter03/10.scala: -------------------------------------------------------------------------------- 1 | import java.awt.datatransfer._ 2 | import collection.JavaConversions.asScalaBuffer 3 | import collection.mutable.Buffer 4 | 5 | val flavors = SystemFlavorMap.getDefaultFlavorMap.asInstanceOf[SystemFlavorMap] 6 | 7 | val res: Buffer[String] = flavors.getNativesForFlavor(DataFlavor.imageFlavor) 8 | 9 | println(res) -------------------------------------------------------------------------------- /Chapter04/01.scala: -------------------------------------------------------------------------------- 1 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 2 | 3 | val gizmos = Map("iPad3" -> 700, "iPhone 5" -> 600, "MacBook Pro Retina" -> 2000) 4 | 5 | val discount = for( (k,v) <- gizmos ) yield (k, v * 0.9) 6 | 7 | prn(gizmos) 8 | prn(discount) -------------------------------------------------------------------------------- /Chapter04/02.scala: -------------------------------------------------------------------------------- 1 | import scala.io.Source 2 | 3 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 4 | 5 | val source = Source.fromFile("gpl.txt", "UTF-8") 6 | val tokens = source.mkString.split("\\s+") 7 | 8 | val freq = new scala.collection.mutable.HashMap[String, Int] 9 | 10 | tokens foreach { token => 11 | if (freq.contains(token)) 12 | freq(token) += 1 13 | else 14 | freq(token) = 1 15 | } 16 | 17 | prn(freq) 18 | -------------------------------------------------------------------------------- /Chapter04/03.scala: -------------------------------------------------------------------------------- 1 | import scala.io.Source 2 | 3 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 4 | 5 | val source = Source.fromFile("gpl.txt", "UTF-8") 6 | val tokens = source.mkString.split("\\s+") 7 | 8 | var freq = new scala.collection.immutable.HashMap[String, Int] 9 | 10 | tokens foreach { token => 11 | freq = freq + (token -> (freq.getOrElse(token, 0) + 1) ) 12 | } 13 | 14 | prn(freq) 15 | -------------------------------------------------------------------------------- /Chapter04/04.scala: -------------------------------------------------------------------------------- 1 | import scala.io.Source 2 | 3 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 4 | 5 | val source = Source.fromFile("gpl.txt", "UTF-8") 6 | val tokens = source.mkString.split("\\s+") 7 | 8 | var freq = new scala.collection.immutable.TreeMap[String, Int] 9 | 10 | tokens foreach { token => 11 | freq = freq + (token -> (freq.getOrElse(token, 0) + 1) ) 12 | } 13 | 14 | prn(freq) 15 | -------------------------------------------------------------------------------- /Chapter04/05.scala: -------------------------------------------------------------------------------- 1 | import scala.io.Source 2 | import scala.collection.JavaConversions.mapAsScalaMap 3 | 4 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 5 | 6 | val source = Source.fromFile("gpl.txt", "UTF-8") 7 | val tokens = source.mkString.split("\\s+") 8 | 9 | val freq: scala.collection.mutable.Map[String, Int] = new java.util.TreeMap[String, Int] 10 | 11 | tokens foreach { token => 12 | freq(token) = freq.getOrElse(token, 0) + 1 13 | } 14 | 15 | prn(freq) 16 | 17 | -------------------------------------------------------------------------------- /Chapter04/06.scala: -------------------------------------------------------------------------------- 1 | import java.util.Calendar._ 2 | 3 | val days = scala.collection.mutable.LinkedHashMap( 4 | "MONDAY" -> MONDAY, 5 | "TUESDAY" -> TUESDAY, 6 | "WEDNESDAY" -> WEDNESDAY, 7 | "THURSDAY" -> THURSDAY, 8 | "FRIDAY" -> FRIDAY, 9 | "SATURDAY" -> SATURDAY, 10 | "SUNDAY" -> SUNDAY 11 | ) 12 | 13 | for ( (k, v) <- days ) printf("%s=%d\n", k, v) -------------------------------------------------------------------------------- /Chapter04/07.scala: -------------------------------------------------------------------------------- 1 | import scala.collection.JavaConversions.propertiesAsScalaMap 2 | 3 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 4 | 5 | val props = propertiesAsScalaMap(System.getProperties()) 6 | 7 | val maxkey = props.keySet.map(_.length).max 8 | 9 | for( (k,v) <- props ) printf("%-" + maxkey + "s | %s\n", k, v) -------------------------------------------------------------------------------- /Chapter04/08.scala: -------------------------------------------------------------------------------- 1 | import util.Random 2 | 3 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 4 | 5 | def randomArray(n: Int) = { 6 | val a = new Array[Int](n); 7 | for (i <- 0 until a.size) a(i) = Random.nextInt(n) 8 | a 9 | } 10 | 11 | def minmax(values: Array[Int]) = { 12 | (values.min, values.max) 13 | } 14 | 15 | val arr = randomArray(10) 16 | 17 | prn(arr) 18 | 19 | val res = minmax(arr) 20 | 21 | println(res) -------------------------------------------------------------------------------- /Chapter04/09.scala: -------------------------------------------------------------------------------- 1 | import util.Random 2 | 3 | def prn(x: TraversableOnce[_]) = println(x.mkString(x.getClass.getSimpleName + "(", ", ", ")")) 4 | 5 | def randomArray(n: Int) = { 6 | val a = new Array[Int](n); 7 | for (i <- 0 until a.size) a(i) = Random.nextInt(n) 8 | a 9 | } 10 | 11 | def lteqgt(values: Array[Int], v : Int) = ( 12 | values.count(_ < v), 13 | values.count(_ == v), 14 | values.count(_ > v) 15 | ) 16 | 17 | val arr = randomArray(10) 18 | 19 | prn(arr) 20 | 21 | val res = lteqgt(arr, 5) 22 | 23 | println(res) -------------------------------------------------------------------------------- /Chapter04/10.scala: -------------------------------------------------------------------------------- 1 | val caseConverter = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".zip("abcdefghijklmnopqrstuvwxyz").toMap 2 | 3 | var lower = caseConverter('D') 4 | 5 | println(lower) -------------------------------------------------------------------------------- /Chapter04/gpl.txt: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Chapter05/01.scala: -------------------------------------------------------------------------------- 1 | class Counter(private var value: Int = 0) { 2 | def increment() { if (value < Int.MaxValue) value += 1 } 3 | def current = value 4 | } 5 | 6 | val c = new Counter(Int.MaxValue - 1) 7 | 8 | println(c.current) 9 | c.increment() 10 | println(c.current) 11 | c.increment() 12 | println(c.current) 13 | -------------------------------------------------------------------------------- /Chapter05/02.scala: -------------------------------------------------------------------------------- 1 | class BankAccount() { 2 | private var account: Double = 0 3 | 4 | def deposit(value: Double) = { 5 | account += value 6 | } 7 | 8 | def withdraw(value: Double) = { 9 | if (value <= account) 10 | account -= value 11 | else 12 | throw new Exception("Your balance ("+account+") too small for withdraw " + value) 13 | } 14 | 15 | def balance = account 16 | } 17 | 18 | val a = new BankAccount 19 | 20 | try { 21 | a.deposit(100) 22 | println(a.balance) 23 | a.withdraw(50) 24 | println(a.balance) 25 | a.withdraw(100) 26 | println(a.balance) 27 | } catch { 28 | case e: Exception => println(e.getMessage) 29 | } -------------------------------------------------------------------------------- /Chapter05/03.scala: -------------------------------------------------------------------------------- 1 | class Time(private var h: Int = 0, private var m: Int = 0) { 2 | 3 | def hours = h 4 | def minutes = m 5 | 6 | def before(other: Time) = h * 60 + m < other.h * 60 + other.m 7 | 8 | } 9 | 10 | val time = new Time(1, 30) 11 | 12 | println("Time is: " + time.hours + ":" + time.minutes) 13 | 14 | println(time.before(new Time(2, 30))) 15 | println(time.before(new Time(1, 10))) -------------------------------------------------------------------------------- /Chapter05/04.scala: -------------------------------------------------------------------------------- 1 | class Time(h: Int = 0, m: Int = 0) { 2 | 3 | private var mins = h * 60 + m 4 | 5 | def hours = mins / 60 6 | def minutes = mins % 60 7 | 8 | def before(other: Time) = mins < other.mins 9 | 10 | } 11 | 12 | val time = new Time(1, 30) 13 | 14 | println("Time is: " + time.hours + ":" + time.minutes) 15 | 16 | println(time.before(new Time(2, 30))) 17 | println(time.before(new Time(1, 10))) -------------------------------------------------------------------------------- /Chapter05/05.scala: -------------------------------------------------------------------------------- 1 | import scala.reflect.BeanProperty 2 | 3 | class Student(@BeanProperty var Name: String, @BeanProperty var id: Long) 4 | 5 | # scalac 05.scala 6 | # javap -private Student -------------------------------------------------------------------------------- /Chapter05/06.scala: -------------------------------------------------------------------------------- 1 | class Person(var age: Int = 0) { 2 | if (age < 0) age = 0 3 | } 4 | 5 | val p = new Person(5) 6 | println(p.age) 7 | 8 | val n = new Person(-5) 9 | println(n.age) 10 | -------------------------------------------------------------------------------- /Chapter05/07.scala: -------------------------------------------------------------------------------- 1 | class Person(name: String) { 2 | val firstName = name.split("\\s+")(0) 3 | val lastName = name.split("\\s+")(1) 4 | 5 | override def toString = "Person(" + firstName + ", " + lastName + ")" 6 | } 7 | 8 | val p = new Person("John Smith") 9 | println(p) -------------------------------------------------------------------------------- /Chapter05/08.scala: -------------------------------------------------------------------------------- 1 | class Car(val manufactuer : String, val model: String, val year: Int = -1, var license: String = "") { 2 | override def toString = "Car(%s, %s, %d, %s)".format(manufactuer, model, year, license) 3 | } 4 | 5 | val c1 = new Car("Honda", "Civic", 2011, "xx123zz") 6 | println(c1) 7 | val c2 = new Car("Hummer", "H1", 2010) 8 | println(c2) 9 | val c3 = new Car("Opel", "Astra") 10 | println(c3) 11 | -------------------------------------------------------------------------------- /Chapter05/10.scala: -------------------------------------------------------------------------------- 1 | /* 2 | * rewrite following class to it's long version 3 | */ 4 | class Employee(val name: String, var salary: Double) { 5 | def this() { this("John Q. Public", 0.0) } 6 | override def toString = "Employee(%s, %f)".format(name, salary) 7 | } 8 | 9 | // i'm not supposed to do, but a right direction 10 | // proposed by Cay Horstmann: http://stackoverflow.com/a/10999828 11 | 12 | class LongEmployee { 13 | private var _name = "John Q. Public" 14 | var salary = 0.0 15 | 16 | def this(n: String, s: Double) { 17 | this() 18 | _name = n; 19 | salary = s; 20 | } 21 | 22 | def name = _name // read-only property, but private var 23 | override def toString = "LongEmployee(%s, %f)".format(name, salary) 24 | } 25 | 26 | 27 | val e1 = new Employee() 28 | println(e1) 29 | 30 | val l1 = new LongEmployee() 31 | println(l1) 32 | 33 | val e2 = new Employee("John Smith", 100.5) 34 | println(e2) 35 | 36 | val l2 = new LongEmployee("John Smith", 100.5) 37 | println(l2) -------------------------------------------------------------------------------- /Chapter06/01.scala: -------------------------------------------------------------------------------- 1 | object Conversions { 2 | def inchesToSantimeters(value: Double) = value * 2.54 3 | def gallonsToLiters(value: Double) = value * 3.78541178 4 | def milesToKilometers(value: Double) = value * 1.609344 5 | } 6 | 7 | println("%f inch = %f santimeters".format(1.0, Conversions.inchesToSantimeters(1.0))) 8 | println("%f gallon = %f liters".format(1.0, Conversions.gallonsToLiters(1.0))) 9 | println("%f mile = %f kilometers".format(1.0, Conversions.milesToKilometers(1.0))) 10 | -------------------------------------------------------------------------------- /Chapter06/02.scala: -------------------------------------------------------------------------------- 1 | class UnitConversion(val factor: Double) { 2 | def convert(value: Double): Double = factor * value 3 | } 4 | 5 | object InchesToSantimeters extends UnitConversion(2.54) 6 | object GallonsToLiters extends UnitConversion(3.78541178) 7 | object MilesToKilometers extends UnitConversion(1.609344) 8 | 9 | println("%f inch = %f santimeters".format(1.0, InchesToSantimeters.convert(1.0))) 10 | println("%f gallon = %f liters".format(1.0, GallonsToLiters.convert(1.0))) 11 | println("%f mile = %f kilometers".format(1.0, MilesToKilometers.convert(1.0))) -------------------------------------------------------------------------------- /Chapter06/03.scala: -------------------------------------------------------------------------------- 1 | object Origin extends java.awt.Point 2 | 3 | println(Origin) -------------------------------------------------------------------------------- /Chapter06/04.scala: -------------------------------------------------------------------------------- 1 | class Point(x: Int = 0, y: Int = 0) extends java.awt.Point(x, y) 2 | 3 | object Point { 4 | def apply(x: Int = 0, y: Int = 0) = new Point(x, y) 5 | } 6 | 7 | println(Point(3,4)) -------------------------------------------------------------------------------- /Chapter06/05.scala: -------------------------------------------------------------------------------- 1 | object Reverse extends App { 2 | println(args.reverse.mkString(" ")) 3 | } -------------------------------------------------------------------------------- /Chapter06/06.scala: -------------------------------------------------------------------------------- 1 | object Suits extends Enumeration { 2 | type Suits = Value 3 | val Spade = Value("♠") 4 | val Club = Value("♣") 5 | val Heart = Value("♥") 6 | val Diamond = Value("♦") 7 | } 8 | 9 | println(Suits.values); 10 | -------------------------------------------------------------------------------- /Chapter06/07.scala: -------------------------------------------------------------------------------- 1 | object Suits extends Enumeration { 2 | type Suits = Value 3 | val Spade = Value("♠") 4 | val Club = Value("♣") 5 | val Heart = Value("♥") 6 | val Diamond = Value("♦") 7 | def isRed(card: Suits) = card == Heart || card == Diamond 8 | } 9 | 10 | println(for (s <- Suits.values) yield (s, Suits.isRed(s))) -------------------------------------------------------------------------------- /Chapter06/08.scala: -------------------------------------------------------------------------------- 1 | object RGBCube extends Enumeration { 2 | val black = Value(0x000000, "Black") 3 | val red = Value(0xff0000, "Red") 4 | val green = Value(0x00ff00, "Green") 5 | val blue = Value(0x0000ff, "Blue") 6 | val yellow = Value(0xffff00, "Yellow") 7 | val magenta = Value(0xff00ff, "Magenta") 8 | val cyan = Value(0x00ffff, "Cyan") 9 | val white = Value(0xffffff, "White") 10 | } 11 | 12 | for( c <- RGBCube.values ) println("0x%06x: %s".format(c.id, c)) 13 | 14 | -------------------------------------------------------------------------------- /Chapter07/03.scala: -------------------------------------------------------------------------------- 1 | // scalac 03.scala && scala Q3 2 | 3 | package object random { 4 | var seed : Int = 0 5 | 6 | def setSeed(value: Int) = seed = value 7 | def nextInt() = { 8 | seed = seed * 1664525 + 1013904223 % (2 ^ 32) 9 | seed 10 | } 11 | def nextDouble() : Double = nextInt().toDouble / Int.MaxValue.toDouble 12 | } 13 | 14 | import random._ 15 | 16 | object Q3 extends App { 17 | 18 | setSeed((System.currentTimeMillis() / 1000).toInt) 19 | 20 | println(seed) 21 | (1 to 5).foreach(x => println(nextInt())) 22 | (1 to 5).foreach(x => println(nextDouble())) 23 | } -------------------------------------------------------------------------------- /Chapter07/06.scala: -------------------------------------------------------------------------------- 1 | import java.util.{HashMap => JavaHashMap, Map => JavaMap} 2 | import collection.mutable.{HashMap => ScalaHashMap, Map => ScalaMap} 3 | import collection.JavaConverters._ 4 | 5 | val j: JavaMap[Int, String] = new JavaHashMap[Int, String] 6 | 7 | j.put(1, "One") 8 | j.put(2, "Two") 9 | 10 | val s: ScalaMap[Int, String] = new ScalaHashMap() 11 | 12 | for ((k, v) <- j.asScala) s += (k -> v) 13 | 14 | println(s) 15 | -------------------------------------------------------------------------------- /Chapter07/09.scala: -------------------------------------------------------------------------------- 1 | import java.lang.System._ 2 | 3 | val user = getProperty("user.name") 4 | val password = Console.readLine("password:") 5 | 6 | if (password != "secret") 7 | err.println("Invalid password!") 8 | else 9 | println("Welcome %s!".format(user)) -------------------------------------------------------------------------------- /Chapter08/01.scala: -------------------------------------------------------------------------------- 1 | class BankAccount(initialBalance: Double) { 2 | private var balance = initialBalance 3 | def deposit(amount: Double) = { balance += amount; balance } 4 | def withdraw(amount: Double) = { balance -= amount; balance } 5 | override def toString = "Balance = %f".format(balance) 6 | } 7 | 8 | class CheckedAccount(initialBalance: Double, val comission: Double = 1.0) extends BankAccount(initialBalance) { 9 | override def deposit(amount: Double) = super.deposit(amount - comission); 10 | override def withdraw(amount: Double) = super.withdraw(amount + comission); 11 | } 12 | 13 | 14 | val b = new BankAccount(100.0) 15 | 16 | b.deposit(100); 17 | println(b) 18 | 19 | b.withdraw(100); 20 | println(b) 21 | 22 | val a = new CheckedAccount(100.0, 2.0) 23 | 24 | a.deposit(100); 25 | println(a) 26 | 27 | a.withdraw(100); 28 | println(a) 29 | -------------------------------------------------------------------------------- /Chapter08/02.scala: -------------------------------------------------------------------------------- 1 | class BankAccount(initialBalance: Double) { 2 | private var _balance = initialBalance 3 | def deposit(amount: Double) = { _balance += amount; _balance } 4 | def withdraw(amount: Double) = { _balance -= amount; _balance } 5 | def balance(): Double = _balance 6 | override def toString = "Balance = %f".format(balance) 7 | } 8 | 9 | class SavingsAccount( 10 | initialBalance: Double, 11 | val interestRateYear: Double = 0.10, 12 | val freeTransactions: Int = 3, 13 | val comission: Double = 1.0 14 | ) extends BankAccount(initialBalance) { 15 | 16 | var transactionsInMonth: Int = 0 17 | 18 | def isFreeTransaction() = transactionsInMonth <= freeTransactions 19 | 20 | override def deposit(amount: Double) = { 21 | transactionsInMonth += 1 22 | super.deposit(amount - (if (isFreeTransaction()) 0 else comission)) 23 | 24 | } 25 | override def withdraw(amount: Double) = { 26 | transactionsInMonth += 1 27 | super.withdraw(amount + (if (isFreeTransaction()) 0 else comission)) 28 | } 29 | 30 | def earnMonthlyInterest = { 31 | transactionsInMonth = 0 32 | super.deposit(balance() * interestRateYear / 12) 33 | } 34 | } 35 | 36 | 37 | val b = new BankAccount(100.0) 38 | 39 | println("BankAccount") 40 | 41 | b.deposit(100); 42 | println(b) 43 | 44 | b.withdraw(100); 45 | println(b) 46 | 47 | println("SavingAccount") 48 | 49 | val a = new SavingsAccount(100.0, 0.10, 2, 2.0) 50 | 51 | a.deposit(100); 52 | println(a) 53 | 54 | a.withdraw(100); 55 | println(a) 56 | 57 | a.deposit(100); 58 | println(a) 59 | 60 | a.withdraw(100); 61 | println(a) 62 | 63 | a.earnMonthlyInterest 64 | println("Monthly Interest: " + a) 65 | 66 | a.deposit(100); 67 | println(a) 68 | 69 | a.withdraw(100); 70 | println(a) 71 | 72 | -------------------------------------------------------------------------------- /Chapter08/03.scala: -------------------------------------------------------------------------------- 1 | import collection.immutable.List 2 | 3 | abstract class Shape { 4 | val name = "Abstract shape" 5 | override def toString = name 6 | } 7 | 8 | trait Drawable { 9 | def draw() = println(toString) 10 | } 11 | 12 | class Point(val x: Int, val y: Int) { 13 | override def toString = "%d,%d".format(x, y) 14 | } 15 | 16 | object Point { 17 | def apply(x: Int = 0, y: Int = 0) = new Point(x, y) 18 | } 19 | 20 | class Rectangle(val topLeft: Point, val bottomRight: Point) extends Shape with Drawable { 21 | override val name = "Rectangle" 22 | override def toString = { 23 | "%s (%s - %s)".format(name, topLeft.toString, bottomRight.toString) 24 | } 25 | } 26 | 27 | class Circle(val center: Point, val radius: Int) extends Shape with Drawable { 28 | override val name = "Circle" 29 | override def toString = { 30 | "%s (%s: %d)".format(name, center.toString, radius) 31 | } 32 | } 33 | 34 | val l: List[Shape with Drawable] = List( 35 | new Rectangle(Point(1, 1), Point(10, 20)), 36 | new Circle(Point(2, 2), 5) 37 | ) 38 | 39 | for (x <- l) x.draw() 40 | 41 | -------------------------------------------------------------------------------- /Chapter08/04.scala: -------------------------------------------------------------------------------- 1 | import collection.immutable.List 2 | 3 | abstract class Item { 4 | def description: String 5 | def price: Double 6 | override def toString = "%s(%s: %f)".format(this.getClass.getSimpleName, description, price) 7 | } 8 | 9 | class SimpleItem( 10 | override val description: String, 11 | override val price: Double 12 | ) extends Item 13 | 14 | class Bundle extends Item { 15 | private var items: List[Item] = List() 16 | def add(item : Item) = { items = item :: items } 17 | def price: Double = items.map(_.price).sum 18 | def description: String = items.map(_.description).mkString(", ") 19 | } 20 | 21 | 22 | var l: List[Item] = List( 23 | new SimpleItem("iMac 21", 1500), 24 | new SimpleItem("iPhone 4s", 800) 25 | ) 26 | 27 | val b = new Bundle 28 | b.add(new SimpleItem("iPad2", 500)) 29 | b.add(new SimpleItem("MacBook Air 13", 1200)) 30 | 31 | l = b :: l 32 | 33 | l.foreach(println(_)) 34 | 35 | -------------------------------------------------------------------------------- /Chapter08/05.scala: -------------------------------------------------------------------------------- 1 | class Point(val x: Int, val y: Int) { 2 | override def toString = "Point(%d, %d)".format(x, y) 3 | } 4 | 5 | class LabeledPoint(val label: String, x: Int, y: Int) extends Point(x, y) { 6 | override def toString = { "LabeledPoint(%s, %d, %d)".format(label, x, y) } 7 | } 8 | 9 | val a = new Point(1, 1) 10 | println(a) 11 | 12 | val b = new LabeledPoint("Some point", 20, 50) 13 | println(b) 14 | -------------------------------------------------------------------------------- /Chapter08/06.scala: -------------------------------------------------------------------------------- 1 | class Point(val x: Int, val y: Int) { 2 | override def toString = "Point(%d, %d)".format(x, y) 3 | } 4 | 5 | abstract class Shape { 6 | def centerPoint: Point 7 | override def toString = "%s(Center: %s)".format(this.getClass.getSimpleName, centerPoint.toString) 8 | } 9 | 10 | class Rectangle(val topLeft: Point, val bottomRight: Point) extends Shape { 11 | override val centerPoint = new Point((bottomRight.x + topLeft.x) / 2, (bottomRight.y + topLeft.y) / 2) 12 | } 13 | 14 | class Circle(override val centerPoint: Point, val radius: Int) extends Shape 15 | 16 | 17 | val r = new Rectangle(new Point(0,0), new Point(10, 10)) 18 | println(r) 19 | 20 | val c = new Circle(new Point(7, 7), 10) 21 | println(c) 22 | -------------------------------------------------------------------------------- /Chapter08/07.scala: -------------------------------------------------------------------------------- 1 | import java.awt.Rectangle 2 | 3 | class Square(x : Int, y: Int, width: Int) extends Rectangle(x, y, width, width) { 4 | def this() = this(0, 0, 0) 5 | def this(width: Int) = this(0, 0, width) 6 | } 7 | 8 | 9 | val s1 = new Square(1, 1, 3) 10 | println(s1) 11 | 12 | val s2 = new Square() 13 | println(s2) 14 | 15 | val s3 = new Square(5) 16 | println(s3) 17 | 18 | -------------------------------------------------------------------------------- /Chapter08/08.scala: -------------------------------------------------------------------------------- 1 | class Person(val name: String) { 2 | override def toString = getClass.getName + "[name=" + name + "]" 3 | } 4 | 5 | class SecretAgent(codename: String) extends Person(codename) { 6 | override val name = "secret" // Don't want to reveal name... 7 | override val toString = "secret" //... or class name 8 | } 9 | -------------------------------------------------------------------------------- /Chapter08/09.scala: -------------------------------------------------------------------------------- 1 | class Creature { 2 | def range: Int = 10 3 | val env: Array[Int] = new Array[Int](range) 4 | } 5 | 6 | class Ant extends Creature { 7 | override val range = 2 8 | } -------------------------------------------------------------------------------- /Chapter09/01.scala: -------------------------------------------------------------------------------- 1 | import scala.io.Source 2 | import java.io.PrintWriter 3 | val out = new PrintWriter("01.txt") 4 | val source = Source.fromFile("01.out").getLines.toArray[String].reverse.foreach(out.println(_)) 5 | out.close() -------------------------------------------------------------------------------- /Chapter09/01.txt: -------------------------------------------------------------------------------- 1 | GNU GENERAL 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. 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If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Chapter09/02.scala: -------------------------------------------------------------------------------- 1 | import scala.io.Source 2 | import java.io.PrintWriter 3 | 4 | val column = 8 5 | var count: Int = 0 6 | 7 | val source = Source.fromFile("02.txt") 8 | val out = new PrintWriter("02.out") 9 | 10 | for (c <- source) c match { 11 | case '\t' => { 12 | out.print(" " * (column - count % column)) 13 | count = 0 14 | } 15 | case '\n' => { 16 | out.print(c) 17 | count = 0 18 | } 19 | case _ => { 20 | out.print(c) 21 | count += 1 22 | } 23 | } 24 | 25 | source.close() 26 | out.close() -------------------------------------------------------------------------------- /Chapter09/02.txt: -------------------------------------------------------------------------------- 1 | 1 2 4 8 2 | aaa 333 83838383838 888 -------------------------------------------------------------------------------- /Chapter09/03.scala: -------------------------------------------------------------------------------- 1 | io.Source.fromFile("01.txt").mkString.split("""[\s"\.,\)\()/]+""").filter(_.length > 12).distinct.foreach(println(_)) -------------------------------------------------------------------------------- /Chapter09/03.txt: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Chapter09/04.scala: -------------------------------------------------------------------------------- 1 | val numbers = io.Source.fromFile("04.txt").mkString.split("""\s+""").map(_.toDouble) 2 | 3 | println("Numbers: " + numbers.mkString(", ")) 4 | 5 | println("Sum: " + numbers.sum) 6 | println("Avg: " + numbers.sum / numbers.length) 7 | println("Min: " + numbers.min) 8 | println("Max: " + numbers.max) -------------------------------------------------------------------------------- /Chapter09/04.txt: -------------------------------------------------------------------------------- 1 | 1 2 | 2 3 | 3 4 | 4 6.6 333.1 5 | 33 -------------------------------------------------------------------------------- /Chapter09/05.scala: -------------------------------------------------------------------------------- 1 | val out = new java.io.PrintWriter("05.out") 2 | for(i <- 0 to 20) out.println("%8.0f %f".format(math.pow(2.0, i), math.pow(2.0, -i))) -------------------------------------------------------------------------------- /Chapter09/06.scala: -------------------------------------------------------------------------------- 1 | val pattern = """"([^"\\]*([\\]+"[^"\\]*)*)"""".r 2 | 3 | for(str <- io.Source.stdin.getLines) { 4 | pattern findFirstIn str match { 5 | case Some(s: String) => println(s) 6 | case None => 7 | } 8 | } -------------------------------------------------------------------------------- /Chapter09/06.txt: -------------------------------------------------------------------------------- 1 | test1 "test2" test3 2 | test4 "test\" 5" test6 3 | test7 "test \\" 8" test9 4 | -------------------------------------------------------------------------------- /Chapter09/07.scala: -------------------------------------------------------------------------------- 1 | val tokens = io.Source.fromFile("07.txt").mkString.split("""\s+""").filter( 2 | "^[0-9]+(\\.[0-9]+)?$".r findFirstIn _ match { 3 | case Some(_) => false 4 | case None => true 5 | } 6 | ) 7 | 8 | println("Tokents: " + tokens.mkString(", ")) -------------------------------------------------------------------------------- /Chapter09/07.txt: -------------------------------------------------------------------------------- 1 | lkjdlkjln dkhkjhd 2 | dlkj 7474.44 djjd 3 | ""d djdh7883 7373.11 4 | 2 1 5 | 3. 6 | 333 7 | .33 -------------------------------------------------------------------------------- /Chapter09/08.scala: -------------------------------------------------------------------------------- 1 | val html = io.Source.fromURL("http://horstmann.com", "UTF-8").mkString 2 | 3 | val srcPattern = """(?is)<\s*img[^>]*src\s*=\s*['"\s]*([^'"]+)['"\s]*[^>]*>""".r 4 | 5 | for(srcPattern(s) <- srcPattern findAllIn html) println(s) 6 | -------------------------------------------------------------------------------- /Chapter09/09.scala: -------------------------------------------------------------------------------- 1 | import java.io.File 2 | import scala.util.matching.Regex 3 | 4 | def countMatchFiles(dir: File, pattern: Regex): Int = { 5 | val subdirs = dir.listFiles.filter(_.isDirectory) 6 | val fileNames = dir.listFiles.filter(!_.isDirectory).map(_.getName) 7 | 8 | subdirs.map(countMatchFiles(_, pattern)).sum + 9 | (for(f <- fileNames; s <- pattern findFirstIn f) yield s).size 10 | } 11 | 12 | println("Count of *.scala files: %d".format(countMatchFiles(new File("../"), "\\.scala$".r))) 13 | 14 | // more elegant solution 15 | def getFileTree(f: File): Stream[File] = 16 | f #:: (if (f.isDirectory) f.listFiles().toStream.flatMap(getFileTree) else Stream.empty) 17 | 18 | println("More elegant solution: %d".format(getFileTree(new File("../")).filter(_.getName.endsWith(".scala")).size)) -------------------------------------------------------------------------------- /Chapter09/10.scala: -------------------------------------------------------------------------------- 1 | import collection.mutable._ 2 | import java.io._ 3 | 4 | class Person(val name: String) extends Serializable { 5 | private val friends = new ArrayBuffer[Person] 6 | // some kind of DSL :-) 7 | def friend(f : Person) = friends += f 8 | override def toString = "%s {%s}".format(name, friends.map(_.name).mkString(", ")) 9 | } 10 | 11 | object Person { 12 | def apply(name : String) = new Person(name) 13 | } 14 | 15 | object Main extends App { 16 | 17 | val anna = Person("Anna") 18 | val boris = Person("Boris") 19 | val clair = Person("Clair") 20 | 21 | anna friend boris 22 | boris friend anna 23 | anna friend clair 24 | clair friend boris 25 | 26 | val all = Array(anna, boris, clair) 27 | 28 | println("Original objects: " + all.mkString(", ")) 29 | 30 | val out = new ObjectOutputStream(new FileOutputStream("10.out")) 31 | out.writeObject(all) 32 | out.close() 33 | 34 | val in = new ObjectInputStream(new FileInputStream("10.out")) 35 | val res = in.readObject().asInstanceOf[Array[Person]] 36 | in.close() 37 | 38 | println("Restored objects: " + res.mkString(", ")) 39 | } -------------------------------------------------------------------------------- /Chapter10/01.scala: -------------------------------------------------------------------------------- 1 | trait RectangleLike { 2 | def getX(): Double 3 | def getY(): Double 4 | def getWidth(): Double 5 | def getHeight(): Double 6 | def setFrame(x: Double, y: Double, width: Double, height: Double) 7 | 8 | def translate(dx: Double, dy: Double) = { 9 | setFrame(getX() + dx, getY() + dy, getWidth(), getHeight()) 10 | } 11 | 12 | def grow(dx: Double, dy: Double) = { 13 | setFrame(getX() - dx, getY() - dy, getWidth() + 2 * dx, getHeight() + 2 * dy) 14 | } 15 | 16 | override def toString = "[%f, %f, %f, %f]".format(getX(), getY(), getWidth(), getHeight()) 17 | 18 | } 19 | 20 | 21 | val egg = new java.awt.geom.Ellipse2D.Double(5, 10, 20, 30) with RectangleLike 22 | println(egg) 23 | 24 | egg.translate(10, -10) 25 | println(egg) 26 | 27 | egg.grow(10, 20) 28 | println(egg) -------------------------------------------------------------------------------- /Chapter10/02.scala: -------------------------------------------------------------------------------- 1 | import java.awt.Point 2 | 3 | class OrderdedPoint(x: Int, y: Int) extends Point(x, y) with math.Ordered[Point] { 4 | def compare(that: Point): Int = { 5 | if (this.x <= that.x) { 6 | if (this.x == that.x) { 7 | if (this.y < that.y) -1 8 | else if (this.y > that.y) 1 9 | else 0 10 | } else -1 11 | } else 1 12 | } 13 | override def toString = "[%d, %d]".format(getX(), getY()) 14 | } 15 | 16 | val x1 = new OrderdedPoint(1, 1) 17 | val x2 = new OrderdedPoint(1, -1) 18 | val x3 = new OrderdedPoint(2, 1) 19 | 20 | println(x1 < x2) 21 | println(x1 > x2) 22 | println(x1 >= x3) 23 | 24 | 25 | -------------------------------------------------------------------------------- /Chapter10/04.scala: -------------------------------------------------------------------------------- 1 | trait Logger { 2 | def log(msg: String) = {} 3 | } 4 | 5 | trait ConsoleLogger extends Logger { 6 | override def log(msg: String) = Console.println(msg) 7 | } 8 | 9 | trait CaesarLogger extends Logger { 10 | val shift: Int = 3 11 | override def log(msg: String) = { 12 | super.log((for(x <- msg) yield (x + shift).toChar).mkString) 13 | // more elegant 14 | super.log(msg.map(_ + shift).map(_.toChar).mkString) 15 | // speedup but less elegant 16 | super.log(msg.map((x : Char) => (x + shift).toChar).mkString) 17 | } 18 | } 19 | 20 | 21 | class Sample extends Logger { 22 | def doSomeWork() = { 23 | log("Some Log Message") 24 | } 25 | } 26 | 27 | val x = new Sample with ConsoleLogger 28 | x.doSomeWork 29 | 30 | val y = new Sample with ConsoleLogger with CaesarLogger 31 | y.doSomeWork 32 | 33 | val z = new { override val shift = -3} with Sample with ConsoleLogger with CaesarLogger 34 | z.doSomeWork 35 | -------------------------------------------------------------------------------- /Chapter10/05.scala: -------------------------------------------------------------------------------- 1 | import java.beans.{PropertyChangeSupport, PropertyChangeListener, PropertyChangeEvent} 2 | 3 | trait PropertyChangeSupportLike { 4 | private val support = new PropertyChangeSupport(this) 5 | 6 | def addPropertyChangeListener(listener: PropertyChangeListener) { 7 | support.addPropertyChangeListener(listener) 8 | } 9 | 10 | def addPropertyChangeListener(propertyName: String, listener: PropertyChangeListener) { 11 | support.addPropertyChangeListener(propertyName, listener) 12 | } 13 | 14 | def fireIndexedPropertyChange(propertyName: String, index: Int, oldValue: Boolean, newValue: Boolean) { 15 | support.fireIndexedPropertyChange(propertyName, index, oldValue, newValue) 16 | } 17 | 18 | def fireIndexedPropertyChange(propertyName: String, index: Int, oldValue: Int, newValue: Int) { 19 | support.fireIndexedPropertyChange(propertyName, index, oldValue, newValue) 20 | } 21 | 22 | def fireIndexedPropertyChange(propertyName: String, index: Int, oldValue: Object, newValue: Object) { 23 | support.fireIndexedPropertyChange(propertyName, index, oldValue, newValue) 24 | } 25 | 26 | def firePropertyChange(evt: PropertyChangeEvent) { 27 | support.firePropertyChange(evt) 28 | } 29 | 30 | def firePropertyChange(propertyName: String, oldValue: Boolean, newValue: Boolean) { 31 | support.firePropertyChange(propertyName, oldValue, newValue) 32 | } 33 | 34 | def firePropertyChange(propertyName: String, oldValue: Int, newValue: Int) { 35 | support.firePropertyChange(propertyName, oldValue, newValue) 36 | } 37 | 38 | def firePropertyChange(propertyName: String, oldValue: Object, newValue: Object) { 39 | support.firePropertyChange(propertyName, oldValue, newValue) 40 | } 41 | 42 | def getPropertyChangeListeners(): Array[PropertyChangeListener] = support.getPropertyChangeListeners() 43 | def getPropertyChangeListeners(propertyName: String): Array[PropertyChangeListener] = support.getPropertyChangeListeners(propertyName) 44 | 45 | def hasListeners(propertyName: String): Boolean = support.hasListeners(propertyName) 46 | 47 | def removePropertyChangeListener(listener: PropertyChangeListener) = support.removePropertyChangeListener(listener) 48 | def removePropertyChangeListener(propertyName: String, listener: PropertyChangeListener) = support.removePropertyChangeListener(listener) 49 | } 50 | 51 | class BeansPoint(x: Int, y: Int, listener: () => ()) extends java.awt.Point(x, y) with PropertyChangeSupportLike { 52 | def this() = this(0, 0) 53 | } 54 | 55 | val x = new BeansPoint() 56 | 57 | 58 | 59 | 60 | 61 | -------------------------------------------------------------------------------- /Chapter10/07.scala: -------------------------------------------------------------------------------- 1 | trait Animal { 2 | val name: String 3 | def words: String = "" 4 | def say = println("%s: %s".format(name, words)) 5 | } 6 | 7 | trait Endothermy 8 | trait Hypotermy 9 | 10 | trait Mammal extends Animal with Endothermy 11 | 12 | class Dog extends Mammal { 13 | val name = "Bethoven" 14 | override val words = "Haw-Haw" 15 | } 16 | 17 | class Cat extends Mammal { 18 | val name = "Pixel" 19 | override val words = "Meow!" 20 | override def say = { 21 | print("Cat: ") 22 | super.say 23 | } 24 | } 25 | 26 | val d = new Dog() 27 | val c = new Cat() 28 | 29 | d.say 30 | c.say 31 | 32 | 33 | -------------------------------------------------------------------------------- /Chapter10/08.scala: -------------------------------------------------------------------------------- 1 | // read http://stackoverflow.com/questions/10169016/stackoverflow-when-use-bufferedinputstream-as-a-trait-in-scala 2 | import java.io.{InputStream, FileInputStream} 3 | 4 | 5 | trait Buffering { 6 | this: InputStream => 7 | 8 | val BUF_SIZE: Int = 5 9 | private val buf = new Array[Byte](BUF_SIZE) 10 | private var bufsize: Int = 0 11 | private var pos: Int = 0 12 | 13 | override def read(): Int = { 14 | if (pos >= bufsize) { 15 | bufsize = this.read(buf, 0, BUF_SIZE) 16 | if (bufsize > 0) -1 17 | pos = 0 18 | } 19 | pos += 1 20 | buf(pos-1) 21 | } 22 | } 23 | 24 | val f = new FileInputStream("08.txt") with Buffering 25 | 26 | for(i <- 1 to 10) println(f.read()) -------------------------------------------------------------------------------- /Chapter10/08.txt: -------------------------------------------------------------------------------- 1 | 0123456789 -------------------------------------------------------------------------------- /Chapter10/09.scala: -------------------------------------------------------------------------------- 1 | import java.io.{InputStream, FileInputStream} 2 | 3 | trait Logger { 4 | def log(msg: String) 5 | } 6 | 7 | trait NoneLogger extends Logger { 8 | def log(msg: String) = {} 9 | } 10 | 11 | trait PrintLogger extends Logger { 12 | def log(msg: String) = println(msg) 13 | } 14 | 15 | 16 | trait Buffering { 17 | this: InputStream with Logger => 18 | 19 | val BUF_SIZE: Int = 5 20 | private val buf = new Array[Byte](BUF_SIZE) 21 | private var bufsize: Int = 0 22 | private var pos: Int = 0 23 | 24 | override def read(): Int = { 25 | if (pos >= bufsize) { 26 | bufsize = this.read(buf, 0, BUF_SIZE) 27 | log("buffered %d bytes: %s".format(bufsize, buf.mkString(", "))) 28 | if (bufsize > 0) -1 29 | pos = 0 30 | } 31 | pos += 1 32 | buf(pos-1) 33 | } 34 | } 35 | 36 | val f = new FileInputStream("08.txt") with Buffering with PrintLogger 37 | 38 | for(i <- 1 to 10) println(f.read()) -------------------------------------------------------------------------------- /Chapter10/10.scala: -------------------------------------------------------------------------------- 1 | trait IterableInputStream extends java.io.InputStream with Iterable[Byte] { 2 | 3 | class InputStreamIterator(outer: IterableInputStream) extends Iterator[Byte] { 4 | def hasNext: Boolean = outer.available() > 0 5 | def next: Byte = outer.read().toByte 6 | } 7 | 8 | def iterator: Iterator[Byte] = new InputStreamIterator(this) 9 | } 10 | 11 | 12 | val f = new java.io.FileInputStream("10.txt") with IterableInputStream 13 | 14 | for(b <- f) println(b.toChar) 15 | 16 | -------------------------------------------------------------------------------- /Chapter10/10.txt: -------------------------------------------------------------------------------- 1 | 0123456789 -------------------------------------------------------------------------------- /Chapter11/03.scala: -------------------------------------------------------------------------------- 1 | class Fraction(n: Int, d: Int) { 2 | private val num: Int = if (d == 0) 1 else n * sign(d) / gcd(n, d); 3 | private val den: Int = if (d == 0) 0 else d * sign(d) / gcd(n, d); 4 | override def toString = num + "/" + den 5 | def sign(a: Int) = if (a > 0) 1 else if (a < 0) -1 else 0 6 | def gcd(a: Int, b: Int): Int = if (b == 0) math.abs(a) else gcd(b, a % b) 7 | 8 | def +(that: Fraction) = { 9 | new Fraction(this.num * that.den + that.num * this.den, this.den * that.den) 10 | } 11 | def -(that: Fraction) = { 12 | new Fraction(this.num * that.den - that.num * this.den, this.den * that.den) 13 | } 14 | 15 | def *(that: Fraction) = { 16 | new Fraction(this.num * that.num, this.den * that.den) 17 | } 18 | 19 | def /(that: Fraction) = { 20 | new Fraction(this.num * that.den, this.den * that.num) 21 | } 22 | 23 | } 24 | 25 | object Fraction { 26 | def apply(n: Int, d: Int) = new Fraction(n, d) 27 | } 28 | 29 | val x = Fraction(1, 4) 30 | val y = Fraction(1, 2) 31 | 32 | println(x + y) 33 | println(x - y) 34 | println(x * y) 35 | println(x / y) 36 | 37 | -------------------------------------------------------------------------------- /Chapter11/04.scala: -------------------------------------------------------------------------------- 1 | class Money(d: BigInt, c: BigInt) extends Ordered[Money]{ 2 | val dollars: BigInt = d + c / 100 3 | val cents: BigInt = c % 100 4 | override def toString() = "%d.%d".format(dollars, cents) 5 | 6 | def toCents(): BigInt = dollars * 100 + cents 7 | def fromCents(cents: BigInt) = new Money(cents / 100, cents % 100) 8 | 9 | override def compare(that: Money):Int = toCents.compare(that.toCents) 10 | 11 | def +(that: Money) = fromCents(this.toCents + that.toCents) 12 | def -(that: Money) = fromCents(this.toCents - that.toCents) 13 | } 14 | 15 | object Money { 16 | def apply(d: Int, c: Int) = new Money(d, c) 17 | } 18 | 19 | val x = Money(1, 75) 20 | val y = Money(0, 50) 21 | 22 | println(x + y) 23 | println(x - y) 24 | 25 | println(x > y) 26 | 27 | -------------------------------------------------------------------------------- /Chapter11/05.scala: -------------------------------------------------------------------------------- 1 | import collection.mutable.ArrayBuffer 2 | 3 | class Table { 4 | private val chunks = new ArrayBuffer[String] 5 | 6 | def |(chunk: String) = { 7 | chunks += "%s\n".format(chunk) 8 | this 9 | } 10 | 11 | def ||(chunk: String) = { 12 | chunks += "\n%s".format(chunk) 13 | this 14 | } 15 | 16 | override def toString = "\n%s
".format(chunks.mkString) 17 | } 18 | 19 | object Table { def apply() = new Table() } 20 | 21 | val t = Table() | "Java" | "Scala" || "Gosling" | "Odersky" || "JVM" | "JVM,.NET" 22 | 23 | println(t) 24 | 25 | -------------------------------------------------------------------------------- /Chapter11/06.scala: -------------------------------------------------------------------------------- 1 | class ASCIIArt(val art: String) { 2 | 3 | def +(other: ASCIIArt) = new ASCIIArt( 4 | art.split("\n").zip(other.art.split("\n")).map(x => x._1 + x._2).mkString("\n") 5 | ) 6 | 7 | def ^(other: ASCIIArt) = new ASCIIArt( 8 | art + "\n" + other.art 9 | ) 10 | 11 | override def toString = art 12 | } 13 | 14 | 15 | val x = new ASCIIArt( 16 | """ /\_/\ 17 | ( ' ' ) 18 | ( - ) 19 | | | | 20 | (__|__)""") 21 | 22 | val y = new ASCIIArt( 23 | """ ----- 24 | / Hello \ 25 | < Scala | 26 | \ Coder / 27 | -----""") 28 | 29 | println(x + y) 30 | println(x ^ y) -------------------------------------------------------------------------------- /Chapter11/07.scala: -------------------------------------------------------------------------------- 1 | class BitSequence(private var value: Long = 0) { 2 | 3 | implicit def bool2int(b: Boolean) = if (b) 1 else 0 4 | 5 | def update(bit: Int, state: Int) = value |= (state & 1L) << bit % 64 6 | def apply(bit: Int): Int = if ((value & 1L << bit % 64) > 0) 1 else 0 7 | 8 | override def toString = "%64s".format(value.toBinaryString).replace(" ", "0") 9 | } 10 | 11 | 12 | val x = new BitSequence() 13 | 14 | x(5) = 1 15 | x(63) = 1 16 | x(64) = 1 17 | 18 | println(x(5)) 19 | 20 | println(x) 21 | -------------------------------------------------------------------------------- /Chapter11/08.scala: -------------------------------------------------------------------------------- 1 | class Matrix(val m: Int, val n: Int) { 2 | 3 | private val value = Array.ofDim[Double](m, n) 4 | 5 | def update(x: Int, y: Int, v: Double) = value(x)(y) = v 6 | def apply(x: Int, y: Int) = value(x)(y) 7 | 8 | def +(other: Matrix) = { 9 | require (n == other.n) 10 | require (m == other.m) 11 | 12 | var res = new Matrix(m, n) 13 | for(i <- 0 until m; j <- 0 until n) { 14 | res(i, j) = this.value(i)(j) + other.value(i)(j) 15 | } 16 | res 17 | } 18 | 19 | def -(other: Matrix) = this + other * -1 20 | 21 | 22 | 23 | def *(factor: Double) = { 24 | var res = new Matrix(m, n) 25 | for(i <- 0 until m; j <- 0 until n) { 26 | res(i, j) = this.value(i)(j) * factor 27 | } 28 | res 29 | } 30 | 31 | private def prod(other: Matrix, i: Int, j: Int) = { 32 | (for (k <- 0 until n) yield value(i)(k) * other.value(j)(k)).sum 33 | } 34 | 35 | def *(other: Matrix) = { 36 | require(n == other.m) 37 | var res = new Matrix(m, n) 38 | for(i <- 0 until m; j <- 0 until n) { 39 | res(i, j) = prod(other, i, j) 40 | } 41 | res 42 | } 43 | 44 | override def toString = value.map(_.mkString(" ")).mkString("\n") 45 | } 46 | 47 | val x = new Matrix(2, 2) 48 | x(0, 0) = 1 49 | x(0, 1) = 2 50 | x(1, 0) = 3 51 | x(1, 1) = 4 52 | 53 | println(x) 54 | println() 55 | println(x * 2) 56 | println() 57 | println(x * 2 - x) 58 | println() 59 | 60 | println((x * 2) * (x * 3)) -------------------------------------------------------------------------------- /Chapter11/09.scala: -------------------------------------------------------------------------------- 1 | object RichFile { 2 | def unapply(s: String) = { 3 | val pos = s.lastIndexOf("/") 4 | if (pos == -1) None else Some((s.substring(0, pos), s.substring(pos + 1))) 5 | } 6 | } 7 | 8 | val RichFile(path, name) = "/home/user/test.txt" 9 | 10 | println("Path: %s, File: %s".format(path, name)) 11 | -------------------------------------------------------------------------------- /Chapter11/10.scala: -------------------------------------------------------------------------------- 1 | object RichFile { 2 | def unapplySeq(s: String): Option[Seq[String]] = { 3 | if (s.trim == "") None else Some(s.trim.split("/")) 4 | } 5 | } 6 | 7 | val RichFile(first, middle, last) = "home/user/text.txt" 8 | 9 | println("First: %s, Middle: %s, Last: %s".format(first, middle, last)) -------------------------------------------------------------------------------- /Chapter12/01.scala: -------------------------------------------------------------------------------- 1 | def values(fun: (Int) => Int, low: Int, high: Int) = (low to high) map { x => (x, fun(x)) } 2 | 3 | val x = values(x => x * x, -5, 5) 4 | 5 | println(x) 6 | -------------------------------------------------------------------------------- /Chapter12/02.scala: -------------------------------------------------------------------------------- 1 | val a = new Array[Int](10).map(x => util.Random.nextInt(10)) 2 | 3 | println(a.mkString(",")) 4 | 5 | val max = a.reduceLeft((x, y) => if (x > y) x else y) 6 | 7 | println(max) -------------------------------------------------------------------------------- /Chapter12/03.scala: -------------------------------------------------------------------------------- 1 | def fac(n: Int) = (0 to n).reduceLeft((a, b) => if(a == 0) 1 else (a * b)) 2 | 3 | for(i <- 0 to 10) { 4 | println("%d %d".format(i, fac(i))) 5 | } 6 | -------------------------------------------------------------------------------- /Chapter12/04.scala: -------------------------------------------------------------------------------- 1 | def factorial(n: Int) = (1 to n).foldLeft(1)(_ * _) 2 | 3 | println(factorial(-3)) 4 | println(factorial(5)) -------------------------------------------------------------------------------- /Chapter12/05.scala: -------------------------------------------------------------------------------- 1 | def largest(fun: (Int) => Int, inputs: Seq[Int]) = inputs.map(fun(_)).max 2 | 3 | println(largest(x => 10 * x - x * x, 1 to 10)) -------------------------------------------------------------------------------- /Chapter12/06.scala: -------------------------------------------------------------------------------- 1 | def largest(fun: (Int) => Int, inputs: Seq[Int]) = inputs.map(x => (x, fun(x))).reduceLeft((x,y) => if (x._2 > y._2) x else y)._1 2 | 3 | println(largest(x => 10 * x - x * x, 1 to 10)) -------------------------------------------------------------------------------- /Chapter12/07.scala: -------------------------------------------------------------------------------- 1 | def ajustToPair(fun: (Int, Int) => Int) = (x: (Int, Int)) => fun(x._1, x._2) 2 | 3 | val x = ajustToPair(_ * _)((6, 7)) 4 | println(x) 5 | 6 | val pairs = (1 to 10) zip (11 to 20) 7 | println(pairs) 8 | 9 | val y = pairs.map(ajustToPair(_ + _)) 10 | println(y) 11 | -------------------------------------------------------------------------------- /Chapter12/08.scala: -------------------------------------------------------------------------------- 1 | val a = Array("Hello", "beautyful", "world", "!") 2 | val b = a.map(_.length) 3 | 4 | println(a.mkString(", ")) 5 | println(b.mkString(", ")) 6 | 7 | val y = a.corresponds(b)(_.length == _) 8 | 9 | println(y) 10 | -------------------------------------------------------------------------------- /Chapter12/09.scala: -------------------------------------------------------------------------------- 1 | def corresponds[A, B](a: Seq[A], b: Seq[B], f: (A, B) => Boolean) = (a zip b).map(x => f(x._1, x._2)).count(!_) == 0 2 | 3 | val a = Array("Hello", "beautyful", "world", "!") 4 | val b = a.map(_.length) 5 | 6 | println(a.mkString(", ")) 7 | println(b.mkString(", ")) 8 | 9 | val y = corresponds(a, b, (x: String, y: Int) => x.length == y) 10 | 11 | println(y) 12 | -------------------------------------------------------------------------------- /Chapter12/10.scala: -------------------------------------------------------------------------------- 1 | def unless(condition: => Boolean)(block: => Unit) { if (!condition) { block } } 2 | 3 | unless (0 > 1) { println("Unless!") } -------------------------------------------------------------------------------- /Chapter13/01.scala: -------------------------------------------------------------------------------- 1 | import scala.collection.mutable._ 2 | 3 | def indexes(s: String) = { 4 | var res = new HashMap[Char, LinkedHashSet[Int]]() 5 | 6 | for((c, i) <- s.zipWithIndex) { 7 | val set = res.getOrElse(c.toChar, new LinkedHashSet[Int]) 8 | set += i 9 | res(c.toChar) = set 10 | } 11 | 12 | res 13 | } 14 | 15 | val x = indexes("Missisipi") 16 | println(x) -------------------------------------------------------------------------------- /Chapter13/02.scala: -------------------------------------------------------------------------------- 1 | def indexes(s: String) = 2 | s.zipWithIndex.groupBy(_._1).map(x => (x._1, x._2.map(_._2).toList)) 3 | 4 | val x = indexes("Missisipi") 5 | println(x) -------------------------------------------------------------------------------- /Chapter13/03.scala: -------------------------------------------------------------------------------- 1 | // can do it simple way: lst.filter(_ != 0) 2 | // but i think exercise is about of list operations 3 | 4 | def filterZero(lst: List[Int]): List[Int] = lst match { 5 | case Nil => Nil 6 | case h :: t => if (h != 0) h :: filterZero(t) else filterZero(t) 7 | } 8 | 9 | val x = List(5, 7, 0, 18, 22, 0, 12, 1, 0, 5, 0) 10 | 11 | println(x) 12 | 13 | val y = filterZero(x) 14 | 15 | println(y) -------------------------------------------------------------------------------- /Chapter13/04.scala: -------------------------------------------------------------------------------- 1 | 2 | def existIn(a: Array[String], m: Map[String, Int]) = a.flatMap(m.get).toList 3 | 4 | val a = Array("Tom", "Fred", "Harry") 5 | val m = Map("Tom" -> 3, "Dick" -> 4, "Harry" -> 5) 6 | 7 | val x = existIn(a, m) 8 | println(x) 9 | -------------------------------------------------------------------------------- /Chapter13/05.scala: -------------------------------------------------------------------------------- 1 | def mkString[T](s: Seq[T], sep: String = ", "): String = s.map(_.toString)reduceLeft(_.toString + sep + _.toString) 2 | 3 | val a = Array("Tom", "Fred", "Harry") 4 | 5 | println(mkString(a)) -------------------------------------------------------------------------------- /Chapter13/06.scala: -------------------------------------------------------------------------------- 1 | val lst = List(1, 2, 3, 4, 5) 2 | println(lst) 3 | val x = (lst :\ List[Int]())(_ :: _) // foldLeft 4 | println(x) 5 | val y = (List[Int]() /: lst)(_ :+ _) // foldRight 6 | println(y) 7 | val z = (List[Int]() /: lst)((x,y) => y :: x) 8 | println(z) -------------------------------------------------------------------------------- /Chapter13/07.scala: -------------------------------------------------------------------------------- 1 | val prices = List(5.0, 20.0, 9.95) 2 | val quantities = List(10, 2, 1) 3 | 4 | val sum = (prices, quantities).zipped map { _ * _ } 5 | 6 | println(sum) -------------------------------------------------------------------------------- /Chapter13/08.scala: -------------------------------------------------------------------------------- 1 | def arrayDim(a: Array[Int], numOfDim: Int) = a.grouped(numOfDim).toArray.map(_.toArray) 2 | 3 | val a = (1 to 9).toArray 4 | val x = arrayDim(a, 3) 5 | 6 | println(x.deep.mkString(", ")) -------------------------------------------------------------------------------- /Chapter13/10.scala: -------------------------------------------------------------------------------- 1 | val str = io.Source.fromFile("10.txt").mkString 2 | 3 | def printMills(msg: String)(block: => Unit) { 4 | val start = System.currentTimeMillis() 5 | block 6 | val end = System.currentTimeMillis() 7 | println(msg.format(end-start)) 8 | } 9 | 10 | printMills("Using mutable collection: %d ms") { 11 | val freq = new collection.mutable.HashMap[Char, Int] 12 | for (c <- str) freq(c) = freq.getOrElse(c, 0) + 1 13 | println(freq.toSeq.sorted) 14 | } 15 | 16 | 17 | printMills("Using immutable collection: %d ms") { 18 | val freq = str.map(c => (c, 1)).groupBy(_._1).map(x => (x._1, x._2.length)) 19 | println(freq.seq.toSeq.sorted) 20 | } 21 | 22 | printMills("Using mutable parallel collection: %d ms") { 23 | 24 | val freq = str.par.aggregate(new collection.immutable.HashMap[Char, Int])( 25 | (x, c) => x + (c ->(x.getOrElse(c, 0) + 1)), 26 | (map1, map2) => map1 ++ map2.map{ case (k,v) => k -> (v + map1.getOrElse(k,0)) } 27 | ) 28 | 29 | println(freq.toSeq.sorted) 30 | } -------------------------------------------------------------------------------- /Chapter13/10.txt: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it 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Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Chapter14/02.scala: -------------------------------------------------------------------------------- 1 | def swap(p: Tuple2[Int, Int]) = p match { 2 | case (y, x) => (x, y) 3 | } 4 | 5 | val x = (1, 2) 6 | val y = swap(x) 7 | 8 | println(x) 9 | println(y) -------------------------------------------------------------------------------- /Chapter14/03.scala: -------------------------------------------------------------------------------- 1 | def swap(a: Array[Int]) = a match { 2 | case Array(x, y, rest @ _*) => Array(y, x) ++ rest 3 | case _ => a 4 | } 5 | 6 | val x = Array(1, 2, 3, 4) 7 | val y = swap(x) 8 | 9 | println(x.mkString(", ")) 10 | println(y.mkString(", ")) 11 | -------------------------------------------------------------------------------- /Chapter14/04.scala: -------------------------------------------------------------------------------- 1 | abstract class Item 2 | case class Article(description: String, price: Double) extends Item 3 | case class Bundle(description: String, discount: Double, items: Item*) extends Item 4 | case class Multiple(count: Int, item: Item) extends Item 5 | 6 | def price(it: Item): Double = it match { 7 | case Article(_, p) => p 8 | case Bundle(_, disc, its @ _*) => its.map(price _).sum - disc 9 | case Multiple(count, item) => price(item) * count 10 | } 11 | 12 | val x = Bundle("Father's day special", 20.0, 13 | Multiple(1, Article("Scala for the Impatient", 39.95)), 14 | Bundle("Anchor Distillery Sampler", 10.0, 15 | Article("Old Potrero Straight Rye Whiskey", 79.95), 16 | Article("Junípero Gin", 32.95) 17 | ) 18 | ) 19 | 20 | println(price(x)) 21 | 22 | -------------------------------------------------------------------------------- /Chapter14/05.scala: -------------------------------------------------------------------------------- 1 | 2 | def sumLeaf(list: List[Any]) : Int = { 3 | (for(elem <- list) yield ( 4 | elem match { 5 | case x: List[Int] => sumLeaf(x) 6 | case x: Int => x 7 | case _ => 0 8 | } 9 | )).sum 10 | } 11 | 12 | val x = List(List(3, 8), 2, List(5)) 13 | 14 | println(x) 15 | println(sumLeaf(x)) -------------------------------------------------------------------------------- /Chapter14/06.scala: -------------------------------------------------------------------------------- 1 | sealed abstract class BinaryTree 2 | case class Leaf(value: Int) extends BinaryTree 3 | case class Node(left: BinaryTree, right: BinaryTree) extends BinaryTree 4 | 5 | def leafSum(tree: BinaryTree): Int = tree match { 6 | case Node(left, right) => leafSum(left) + leafSum(right) 7 | case Leaf(x) => x 8 | } 9 | 10 | val x = Node(Node(Leaf(3), Leaf(8)), Leaf(5)) 11 | println(x) 12 | println(leafSum(x)) 13 | -------------------------------------------------------------------------------- /Chapter14/07.scala: -------------------------------------------------------------------------------- 1 | sealed abstract class BinaryTree 2 | case class Leaf(value: Int) extends BinaryTree 3 | case class Node(leafs: BinaryTree*) extends BinaryTree 4 | 5 | def leafSum(tree: BinaryTree): Int = tree match { 6 | case Node(leafs @ _*) => leafs.map(leafSum _).sum 7 | case Leaf(x) => x 8 | } 9 | 10 | val x = Node(Node(Leaf(3), Leaf(8)), Leaf(2), Node(Leaf(5))) 11 | println(x) 12 | println(leafSum(x)) 13 | -------------------------------------------------------------------------------- /Chapter14/08.scala: -------------------------------------------------------------------------------- 1 | sealed abstract class BinaryTree 2 | case class Leaf(value: Int) extends BinaryTree 3 | case class Node(op: Char, leafs: BinaryTree*) extends BinaryTree 4 | 5 | def eval(tree: BinaryTree): Int = tree match { 6 | case Node(op, leafs @ _*) => op match { 7 | case '+' => leafs.map(eval _).sum 8 | case '-' => -leafs.map(eval _).sum 9 | case '*' => leafs.map(eval _).product 10 | } 11 | case Leaf(x) => x 12 | } 13 | 14 | val x = Node('+', Node('*', Leaf(3), Leaf(8)), Leaf(2), Node('-', Leaf(5))) 15 | 16 | println(x) 17 | println(eval(x)) 18 | -------------------------------------------------------------------------------- /Chapter14/09.scala: -------------------------------------------------------------------------------- 1 | def sum(lst: List[Option[Int]]) = lst.map(_.getOrElse(0)).sum 2 | 3 | val x = List(Some(1), None, Some(2), None, Some(3)) 4 | 5 | println(sum(x)) -------------------------------------------------------------------------------- /Chapter14/10.scala: -------------------------------------------------------------------------------- 1 | import math.sqrt 2 | 3 | type T = Double => Option[Double] 4 | 5 | def compose(f: T, g: T): T = { 6 | (x: Double) => f(x) match { 7 | case Some(x) => g(x) 8 | case None => None 9 | } 10 | } 11 | 12 | def f(x: Double) = if (x >= 0) Some(sqrt(x)) else None 13 | def g(x: Double) = if (x != 1) Some(1 / (x - 1)) else None 14 | val h = compose(f, g) 15 | 16 | println(h(4)) 17 | println(h(1)) 18 | println(h(0)) -------------------------------------------------------------------------------- /Chapter15/06.scala: -------------------------------------------------------------------------------- 1 | import concurrent.ops.spawn 2 | 3 | object BooleanHolder { 4 | @volatile var value: Boolean = false; 5 | } 6 | 7 | 8 | spawn { 9 | Thread.sleep(100); 10 | BooleanHolder.value = true 11 | println("Thread1: setting value to TRUE!") 12 | } 13 | 14 | spawn { 15 | while(!BooleanHolder.value) Thread.sleep(20); 16 | println("Thread2: value is TRUE!") 17 | } 18 | -------------------------------------------------------------------------------- /Chapter16/02.scala: -------------------------------------------------------------------------------- 1 | val x =
    2 |
  • Opening bracket: [
    • 3 |
  • Closing bracket: ]
    • 4 |
  • Opening brace: {{
    • 5 |
  • Closing brace: }}
    • 6 |
7 | 8 | println(x) -------------------------------------------------------------------------------- /Chapter16/04.scala: -------------------------------------------------------------------------------- 1 | // scala -classpath ./*.jar 04.scala 2 | 3 | import scala.xml.XML 4 | 5 | val parser = (new org.ccil.cowan.tagsoup.jaxp.SAXFactoryImpl).newSAXParser 6 | val html = XML.withSAXParser(parser).load(new java.net.URL("http://autopeople.ru/")) 7 | val images = (html \\ "img").filterNot(_.attributes("alt").isDefined) 8 | 9 | println(images.mkString("\n")); 10 | 11 | -------------------------------------------------------------------------------- /Chapter16/05.scala: -------------------------------------------------------------------------------- 1 | // scala -classpath ./*.jar 05.scala 2 | 3 | import scala.xml.XML 4 | 5 | val parser = (new org.ccil.cowan.tagsoup.jaxp.SAXFactoryImpl).newSAXParser 6 | val html = XML.withSAXParser(parser).load(new java.net.URL("http://autopeople.ru/")) 7 | val src = (html \\ "img").flatMap(_.attributes("src")) 8 | 9 | println(src.mkString("\n")); 10 | 11 | 12 | -------------------------------------------------------------------------------- /Chapter16/06.scala: -------------------------------------------------------------------------------- 1 | // scala -classpath ./*.jar 06.scala 2 | 3 | import scala.xml._ 4 | 5 | val parser = (new org.ccil.cowan.tagsoup.jaxp.SAXFactoryImpl).newSAXParser 6 | val html = XML.withSAXParser(parser).load(new java.net.URL("http://yandex.ru/")) 7 | 8 | val links = (html \\ "a") map { (x: Node) => (x.attribute("href").getOrElse("").toString, x.text) } filter {_._1.startsWith("http")} 9 | 10 | println(links.mkString("\n")); 11 | 12 | 13 | -------------------------------------------------------------------------------- /Chapter16/07.scala: -------------------------------------------------------------------------------- 1 | def MapToHtml(x: Map[String, String]) = { 2 |
{for ((k,v) <- x) yield
{k}
{v}
}
3 | } 4 | 5 | val x = Map("A" -> "1", "B" -> "2") 6 | 7 | println(MapToHtml(x)) -------------------------------------------------------------------------------- /Chapter16/tagsoup-1.2.1.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hempalex/scala-impatient/383939e9018c7324b5d6a817235098d0d56b401d/Chapter16/tagsoup-1.2.1.jar --------------------------------------------------------------------------------