├── Variables and Constants.playground ├── contents.xcplayground ├── timeline.xctimeline └── section-1.swift └── README.md /Variables and Constants.playground/contents.xcplayground: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 |

5 |


6 |     
7 |




--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | Exploring Swift
2 | ===============
3 | 
4 | Accompanying code and playground files for my series of post about Swift on my blog where I explore obscure and interesting things about Apple's new language.
5 | 
6 | * [Variables and Constants][1]
7 | 
8 | [1]:http://totocaster.com/2014/exploring-swift-variables-constants/
9 | 


--------------------------------------------------------------------------------
/Variables and Constants.playground/timeline.xctimeline:
--------------------------------------------------------------------------------
 1 | 
 2 | 
 4 |    
 5 |       
 7 |       
 8 |    
 9 | 
10 | 


--------------------------------------------------------------------------------
/Variables and Constants.playground/section-1.swift:
--------------------------------------------------------------------------------
 1 | /* 
 2 |  * Exploring Swift
 3 |  * Variables and Constants
 4 |  * by Toto Tvalavadze
 5 |  *
 6 |  * This playground is accompanying series of posts about
 7 |  * Swift programing language on http://totocaster.com
 8 |  *
 9 |  * http://totocaster.com/2014/exploring-swift-variables-constants/
10 |  */
11 | 
12 | let numberOfMaximumCarsInParking = 1000 // Changing this in future will cause compile error
13 | var numberOfFreeSpacesInParking = 123
14 | 
15 | var carParkingName:String; // No initialisation is fine, but type has to be annotated
16 | 
17 | carParkingName = "Underground on Some Street"
18 | 
19 | // Comment line above and you'll get compile error in if statement
20 | // because you can not use uninitialised variable
21 | if carParkingName == "Underground on Some Street" {
22 |     "You are here"
23 | }
24 | 
25 | // Single line multiple declaration
26 | var x = 1, y = 2, z = "This is string" // Works for constants too
27 | 
28 | let 🐶🐮 = "dogcow" // Please don't do this
29 | // let ✊🍆 = "fisteggplant" // this doesn't work for some reason
30 | 
31 | println("Currently \(carParkingName) has \(numberOfFreeSpacesInParking) free parking places") // To see result, open console in Xcode or Assistant Editor in Playground
32 | 
33 | let numbers = [x,y]         // [1,2] as constant
34 | x = 5
35 | numbers                     // again [1,2] and no error
36 | numbers[0] = 5              // this will work
37 | numbers                     // [5,2]
38 | 
39 | 
40 | class MyNumber {
41 |     init (value:Int = 0){
42 |         self.valueNumber = value
43 |     }
44 |     
45 |     var valueNumber:Int;
46 |     
47 |     var value:Int {
48 |         get {
49 |             return valueNumber
50 |         }
51 |         set {
52 |             valueNumber = newValue
53 |         }
54 |     }
55 | }
56 | 
57 | let a = MyNumber(value:4)
58 | var b = MyNumber(value:7)
59 | 
60 | let myNumbres = [a,b]       // [4,7] as constant
61 | a.value = 7                 // a is instance, thus referance type
62 | myNumbres                   // [7,7] 
63 | 
64 | 
65 | 
66 | 
67 | /* This is multiline comment
68 | 
69 |     /* So this is, but interesting part is one line below */
70 | 
71 |     This line, would be illegal in some languages,
72 |     but in Swift also belongs to comment scope above.
73 | */
74 | 
75 | let isSwiftMultilineCommentAwesome = true
76 | 
77 | 
78 | 


--------------------------------------------------------------------------------