32 |
33 |
34 |
35 |
--------------------------------------------------------------------------------
/src/lessons/lessons.ts:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/codelex-io/typescript-course/505a1d1332e68cb86f241cbe59fc0c88a32b0117/src/lessons/lessons.ts
--------------------------------------------------------------------------------
/src/practice/answers.ts:
--------------------------------------------------------------------------------
1 | export {};
2 | /*
3 | In this file you will find coding challenges. Add your code in designated areas.
4 | You can find answers in answers.ts file.
5 | Add types to all variables you create.
6 | */
7 |
8 | /*
9 | Challenge 1 ----------------------------------------------------------------------------------
10 | */
11 |
12 | /*
13 | Declare a constant variable myName and set it's value to your name. Log myName in console.
14 | */
15 |
16 | const myName: string = "Baiba";
17 | console.log(myName);
18 |
19 | /*
20 | Declare a variable yourAge and set it's value to 100.
21 | Change the value of yourAge to your age on the next line. Log yourAge in console.
22 | */
23 |
24 | let yourAge: number = 100;
25 | yourAge = 27;
26 | console.log(yourAge);
27 |
28 | /*
29 | Declare a constant variable favouriteColor and set it's value to your favourite color.
30 | Log favouriteColor in console.
31 | Try to change the value or favouriteColor on next line.
32 | Understand why it isn't working and delete it.
33 | */
34 |
35 | const favouriteColor: string = "Green";
36 | console.log(favouriteColor);
37 | // favouriteColor = "Red";
38 |
39 | /*
40 | Declare a variable favouriteFood and don't set it's value. Type string.
41 | On the next line change favouriteFood value to your favourite food.
42 | Log favouriteFood in console.
43 | */
44 |
45 | let favouriteFood: string;
46 | favouriteFood = "Pasta";
47 | console.log(favouriteFood);
48 |
49 | /*
50 | Challenge 2 ----------------------------------------------------------------------------------
51 | */
52 |
53 | /*
54 | Declare a constant variable fiftyNine and set it's value to "59".
55 | Declare a constant variable fiftyNineAsNumber and set it's value to fiftyNine convert converted to number.
56 | */
57 |
58 | const fiftyNine: string = "59";
59 | const fiftyNineAsNumber: number = Number(fiftyNine);
60 |
61 | /*
62 | Declare a constant variable food and set it's value to a random food item
63 | Declare a constant variable randomItem and set it's value to a random item
64 | */
65 |
66 | const food: string = "Pasta";
67 | const randomItem: string = "Phone";
68 |
69 | /*
70 | Declare a constant variable randomSentence and
71 | set it's value to "My favorite food is {food} and I bought a new {randomItem}".
72 | Use + symbol to construct the sentence
73 | replacing {food} and {randomItem} with your previously declared variables.
74 | Log randomSentence in console.
75 | */
76 |
77 | const randomSentence: string =
78 | "My favorite food is " + food + " and I bought a new " + randomItem;
79 | console.log(randomSentence);
80 |
81 | /*
82 | Declare a constant variable randomSentenceWithLiterals
83 | and set it's value to "My favorite food is {food} and I bought a new {randomItem}"
84 | Use template literals to construct the sentence
85 | replacing {food} and {randomItem} with your previously declared variables.
86 | Log randomSentenceWithLiterals in console.
87 | */
88 |
89 | const randomSentenceWithLiterals: string = `My favorite food is ${food} and I bought a new ${randomItem}`;
90 | console.log(randomSentenceWithLiterals);
91 |
92 | /*
93 | Declare a constant variable importantMessage and set it's value to "WATER THE FLOWERS!".
94 | Declare a constant variable unimportantMessage and set it's value to importantMessage formatted
95 | to be all lowercase letters and with no exclamation mark.
96 | Log unimportantMessage in console.
97 | */
98 |
99 | const importantMessage: string = "WATER THE FLOWERS!";
100 |
101 | const unimportantMessage: string = importantMessage
102 | .toLowerCase()
103 | .replace("!", "");
104 |
105 | console.log(unimportantMessage);
106 |
107 | /*
108 | Declare a constant variable story
109 | and set it's value to "The quick brown fox jumps over the lazy dog.".
110 | Declare a constant variable shortStory and set it's value to story formatted
111 | to be only "lazy dog".
112 | Log shortSentence in console.
113 | */
114 |
115 | const story: string = "The quick brown fox jumps over the lazy dog.";
116 | const shortStory: string = story.slice(35, 43);
117 | console.log(shortStory);
118 |
119 | /*
120 | Challenge 3 ----------------------------------------------------------------------------------
121 | */
122 |
123 | /*
124 | Declare a constant variable bigNumber and set it's value to 307.98765.
125 | Declare a constant variable twelve and set it's value to 12.
126 | Declare a variable thirdChallengeResult and don't set it's value. Type number.
127 | Change thirdChallengeResult value on next line to equal bigNumber minus twelve.
128 | Log thirdChallengeResult in the console.
129 | Change thirdChallengeResult value on next line to equal bigNumber divided by twelve.
130 | Log thirdChallengeResult in the console.
131 | Change thirdChallengeResult value on next line to equal bigNumber rounded to a whole number (rounded down).
132 | Log thirdChallengeResult in the console.
133 | Change thirdChallengeResult value on next line to equal bigNumber rounded to a whole number (rounded up).
134 | Log thirdChallengeResult in the console.
135 | Change thirdChallengeResult value on next line to equal bigNumber rounded to 2 numbers after the decimal point.
136 | Log thirdChallengeResult in the console.
137 | Declare a constant variable thirdChallengeResultAsString of
138 | type string and set it's value to result formatted as a string;
139 | */
140 |
141 | const bigNumber: number = 307.987655;
142 | const twelve: number = 12;
143 |
144 | let thirdChallengeResult: number;
145 |
146 | thirdChallengeResult = bigNumber - twelve;
147 | console.log(thirdChallengeResult);
148 |
149 | thirdChallengeResult = bigNumber / twelve;
150 | console.log(thirdChallengeResult);
151 |
152 | thirdChallengeResult = Math.floor(bigNumber);
153 | console.log(thirdChallengeResult);
154 |
155 | thirdChallengeResult = Math.round(bigNumber);
156 | console.log(thirdChallengeResult);
157 |
158 | thirdChallengeResult = Number(bigNumber.toFixed(2));
159 | console.log(thirdChallengeResult);
160 |
161 | const thirdChallengeResultAsString: string = String(bigNumber);
162 |
163 | /*
164 | Challenge 4 ----------------------------------------------------------------------------------
165 | */
166 |
167 | /*
168 | Declare a constant variable isHuman and set it's value to true.
169 | Declare a constant variable isWizard and set it's value to isHuman formatted to be the opposite value.
170 | Log isWizard in console.
171 | */
172 |
173 | const isHuman: boolean = true;
174 | const isWizard: boolean = !isHuman;
175 |
176 | console.log(isWizard);
177 |
178 | /*
179 | Declare a constant variable five and set it's value to 5.
180 | Declare a constant variable eleven and set it's value to 11.
181 | Declare a constant variable isElevennPlusFiveLargerThanTen and set it's value to
182 | a comparison of eleven plus five is larger than 10.
183 | Log isElevenPlusFiveLargerThanTen in console.
184 | */
185 |
186 | const five: number = 5;
187 | const eleven: number = 11;
188 |
189 | const isElevenPlusFiveLargerThanTen: boolean = eleven + five > 10;
190 | console.log(isElevenPlusFiveLargerThanTen);
191 |
192 | /*
193 | Declare a constant variable boringStory and set it's value to "This is a boring story".
194 | Log boringStory in console formatted to a boolean value.
195 | Log boringStory in console formatted to the opposite boolean value.
196 | Log boringStory in console formatted to a boolean value that indicates whether boringStory includes "cat".
197 | */
198 |
199 | const boringStory: string = "This is a boring story!";
200 |
201 | console.log(!!boringStory);
202 | console.log(!boringStory);
203 | console.log(boringStory.includes("cat"));
204 |
205 | /*
206 | Challenge 5 ----------------------------------------------------------------------------------
207 | */
208 |
209 | /*
210 | Declare a constant variable randomFact and set it's value to "Copper door knobs are self-disinfecting.".
211 | Log sentence length in console.
212 | Log in console comparioson of whether sencence length is larger than 5 or larger than 20.
213 | Log in console comparison of whether sencence length is exactly 40
214 | and is equal to "Copper door knobs are self-disinfecting.".
215 | */
216 |
217 | const randomFact: string = "Copper door knobs are self-disinfecting.";
218 |
219 | console.log(randomFact.length);
220 | console.log(randomFact.length > 5 || randomFact.length > 20);
221 | console.log(
222 | randomFact.length === 40 && "Copper door knobs are self-disinfecting."
223 | );
224 |
225 | /*
226 | Challenge 6 ----------------------------------------------------------------------------------
227 | */
228 |
229 | /*
230 | Declare a constant variable hasDriversLicense and set it's value to true.
231 | Declare a constant variable hasGoodVision and set it's value to true.
232 | Declare a constant variable isTired and set it's value to false.
233 | Create an if statement and console log "Sarah is able to drive!", if Sarah has Drivers License,
234 | has good vision and is not tired.
235 | Else console log "Someone else should drive..."
236 | */
237 |
238 | const hasDriversLicense: boolean = true;
239 | const hasGoodVision: boolean = true;
240 | const isTired: boolean = false;
241 |
242 | if (hasDriversLicense && hasGoodVision && !isTired) {
243 | console.log("Sarah is able to drive!");
244 | } else {
245 | console.log("Someone else should drive...");
246 | }
247 |
248 | /*
249 | Challenge 7 ----------------------------------------------------------------------------------
250 | */
251 |
252 | /*
253 | Change the given if statement to conditional (ternary) operator
254 | */
255 |
256 | const isAwesome: boolean = true;
257 | if (isAwesome) {
258 | console.log("Awesome!");
259 | } else {
260 | console.log("Is not awesome!");
261 | }
262 |
263 | isAwesome ? console.log("Awesome!") : console.log("Is not awesome!");
264 |
265 | /*
266 | Challenge 8 ----------------------------------------------------------------------------------
267 | */
268 |
269 | /*
270 | Declare a variable myAlphabet and set its value to an array of letters A-G.
271 | Console log the length of myAlphabet.
272 | Console log myAlphabet formatted to be a string.
273 | Console log myAlphabet formatted to be in the opposite order.
274 | Console log the first element of myAlphabet.
275 | Console log the last element of myAlphabet.
276 | On the next line change the value of myAlphabet to have another value "Z" (use spread operator).
277 | Console log myAlphabet.
278 | On the next line change the value of myAlphabet to have another value "X" (use push()).
279 | Console log myAlphabet.
280 | */
281 |
282 | let myAlphabet: string[] = ["A", "B", "C", "D", "E", "F", "G"];
283 |
284 | console.log(myAlphabet.length);
285 | console.log(myAlphabet.join(""));
286 | console.log(myAlphabet.reverse());
287 | console.log(myAlphabet[0]);
288 | console.log(myAlphabet[myAlphabet.length - 1]);
289 |
290 | myAlphabet = [...myAlphabet, "Z"];
291 | console.log(myAlphabet);
292 |
293 | myAlphabet.push("X");
294 | console.log(myAlphabet);
295 |
--------------------------------------------------------------------------------
/src/practice/practice.html:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 |
6 | CODELEX
7 |
8 |
27 |
28 |
29 |
30 |
CODELEX
31 |
32 |
33 |
34 |
35 |
--------------------------------------------------------------------------------
/src/practice/practice.ts:
--------------------------------------------------------------------------------
1 | export {};
2 | /*
3 | In this file you will find coding challenges. Add your code in designated areas.
4 | You can find answers in answers.ts file.
5 | Add types to all variables you create.
6 | Command to run the file: npm run practice
7 | */
8 |
9 | /*
10 | Challenge 1 ----------------------------------------------------------------------------------
11 | */
12 |
13 | /*
14 | Declare a constant variable myName and set it's value to your name. Log myName in console.
15 | */
16 |
17 | /* Add your code here */
18 |
19 | /*
20 | Declare a variable yourAge and set it's value to 100.
21 | Change the value of yourAge to your age on the next line. Log yourAge in console.
22 | */
23 |
24 | /* Add your code here */
25 |
26 | /*
27 | Declare a constant variable favouriteColor and set it's value to your favourite color.
28 | Log favouriteColor in console.
29 | Try to change the value or favouriteColor on next line.
30 | Understand why it isn't working and delete it.
31 | */
32 |
33 | /* Add your code here */
34 |
35 | /*
36 | Declare a variable favouriteFood and don't set it's value. Type string.
37 | On the next line change favouriteFood value to your favourite food.
38 | Log favouriteFood in console.
39 | */
40 |
41 | /* Add your code here */
42 |
43 | /*
44 | Challenge 2 ----------------------------------------------------------------------------------
45 | */
46 |
47 | /*
48 | Declare a constant variable fiftyNine and set it's value to "59".
49 | Declare a constant variable fiftyNineAsNumber and set it's value to fiftyNine convert converted to number.
50 | */
51 |
52 | /* Add your code here */
53 |
54 | /*
55 | Declare a constant variable food and set it's value to a random food item
56 | Declare a constant variable randomItem and set it's value to a random item
57 | */
58 |
59 | /* Add your code here */
60 |
61 | /*
62 | Declare a constant variable randomSentence and
63 | set it's value to "My favorite food is {food} and I bought a new {randomItem}".
64 | Use + symbol to construct the sentence
65 | replacing {food} and {randomItem} with your previously declared variables.
66 | Log randomSentence in console.
67 | */
68 |
69 | /* Add your code here */
70 |
71 | /*
72 | Declare a constant variable randomSentenceWithLiterals
73 | and set it's value to "My favorite food is {food} and I bought a new {randomItem}"
74 | Use template literals to construct the sentence
75 | replacing {food} and {randomItem} with your previously declared variables.
76 | Log randomSentenceWithLiterals in console.
77 | */
78 |
79 | /* Add your code here */
80 |
81 | /*
82 | Declare a constant variable importantMessage and set it's value to "WATER THE FLOWERS!".
83 | Declare a constant variable unimportantMessage and set it's value to importantMessage formatted
84 | to be all lowercase letters and with no exclamation mark.
85 | Log unimportantMessage in console.
86 | */
87 |
88 | /* Add your code here */
89 |
90 | /*
91 | Declare a constant variable story
92 | and set it's value to "The quick brown fox jumps over the lazy dog.".
93 | Declare a constant variable shortStory and set it's value to story formatted
94 | to be only "lazy dog".
95 | Log shortSentence in console.
96 | */
97 |
98 | /* Add your code here */
99 |
100 | /*
101 | Challenge 3 ----------------------------------------------------------------------------------
102 | */
103 |
104 | /*
105 | Declare a constant variable bigNumber and set it's value to 307.98765.
106 | Declare a constant variable twelve and set it's value to 12.
107 | Declare a variable thirdChallengeResult and don't set it's value. Type number.
108 | Change thirdChallengeResult value on next line to equal bigNumber minus twelve.
109 | Log thirdChallengeResult in the console.
110 | Change thirdChallengeResult value on next line to equal bigNumber divided by twelve.
111 | Log thirdChallengeResult in the console.
112 | Change thirdChallengeResult value on next line to equal bigNumber rounded to a whole number (rounded down).
113 | Log thirdChallengeResult in the console.
114 | Change thirdChallengeResult value on next line to equal bigNumber rounded to a whole number (rounded up).
115 | Log thirdChallengeResult in the console.
116 | Change thirdChallengeResult value on next line to equal bigNumber rounded to 2 numbers after the decimal point.
117 | Log thirdChallengeResult in the console.
118 | Declare a constant variable thirdChallengeResultAsString of
119 | type string and set it's value to result formatted as a string;
120 | */
121 |
122 | /* Add your code here */
123 |
124 | /*
125 | Challenge 4 ----------------------------------------------------------------------------------
126 | */
127 |
128 | /*
129 | Declare a constant variable isHuman and set it's value to true.
130 | Declare a constant variable isWizard and set it's value to isHuman formatted to be the opposite value.
131 | Log isWizard in console.
132 | */
133 |
134 | /* Add your code here */
135 |
136 | /*
137 | Declare a constant variable five and set it's value to 5.
138 | Declare a constant variable eleven and set it's value to 11.
139 | Declare a constant variable isElevennPlusFiveLargerThanTen and set it's value to
140 | a comparison of eleven plus five is larger than 10.
141 | Log isElevenPlusFiveLargerThanTen in console.
142 | */
143 |
144 | /* Add your code here */
145 |
146 | /*
147 | Declare a constant variable boringStory and set it's value to "This is a boring story".
148 | Log boringStory in console formatted to a boolean value.
149 | Log boringStory in console formatted to the opposite boolean value.
150 | Log boringStory in console formatted to a boolean value that indicates whether boringStory includes "cat".
151 | */
152 |
153 | /* Add your code here */
154 |
155 | /*
156 | Challenge 5 ----------------------------------------------------------------------------------
157 | */
158 |
159 | /*
160 | Declare a constant variable randomFact and set it's value to "Copper door knobs are self-disinfecting.".
161 | Log sentence length in console.
162 | Log in console comparioson of whether sencence length is larger than 5 or larger than 20.
163 | Log in console comparison of whether sencence length is exactly 40
164 | and is equal to "Copper door knobs are self-disinfecting.".
165 | */
166 |
167 | /* Add your code here */
168 |
169 | /*
170 | Challenge 6 ----------------------------------------------------------------------------------
171 | */
172 |
173 | /*
174 | Declare a constant variable hasDriversLicense and set it's value to true.
175 | Declare a constant variable hasGoodVision and set it's value to true.
176 | Declare a constant variable isTired and set it's value to false.
177 | Create an if statement and console log "Sarah is able to drive!", if Sarah has Drivers License,
178 | has good vision and is not tired.
179 | Else console log "Someone else should drive..."
180 | */
181 |
182 | /* Add your code here */
183 |
184 | /*
185 | Challenge 7 ----------------------------------------------------------------------------------
186 | */
187 |
188 | /*
189 | Change the given if statement to conditional (ternary) operator
190 | */
191 |
192 | const isAwesome: boolean = true;
193 | if (isAwesome) {
194 | console.log("Awesome!");
195 | } else {
196 | console.log("Is not awesome!");
197 | }
198 |
199 | /* Add your code here */
200 |
201 | /*
202 | Challenge 8 ----------------------------------------------------------------------------------
203 | */
204 |
205 | /*
206 | Declare a variable myAlphabet and set its value to an array of letters A-G.
207 | Console log the length of myAlphabet.
208 | Console log myAlphabet formatted to be a string.
209 | Console log myAlphabet formatted to be in the opposite order.
210 | Console log the first element of myAlphabet.
211 | Console log the last element of myAlphabet.
212 | On the next line change the value of myAlphabet to have another value "Z" (use spread operator).
213 | Console log myAlphabet.
214 | On the next line change the value of myAlphabet to have another value "X" (use push()).
215 | Console log myAlphabet.
216 | */
217 |
218 | /* Add your code here */
219 |
--------------------------------------------------------------------------------
/src/result/result.ts:
--------------------------------------------------------------------------------
1 | export {};
2 | // console.log() -------------------------------------------------------
3 |
4 | console.log("Sveika pasaule!");
5 | console.log(55);
6 | console.log(55 + 10 - 18 + 6);
7 | console.log("Man patīk", "skriet");
8 | console.log("Šis ir", 2021, "gads");
9 |
10 | const currentYear: number = 2021;
11 | console.log(currentYear);
12 | console.log("Šis ir", currentYear, "gads");
13 |
14 | const currentYearText: string = "Šis ir";
15 | console.log(currentYearText, currentYear);
16 |
17 | // const --------------------------------------------------------------
18 |
19 | // console.log(nextYear);
20 | const nextYear: number = 2022;
21 | const celebration: string = "Jaunais gads";
22 | const isNewYear: boolean = true;
23 |
24 | console.log(nextYear);
25 |
26 | // celebration = "Jāņi";
27 |
28 | // const isNewYear: boolean = false;
29 |
30 | // let ---------------------------------------------------------------
31 |
32 | let description: string | number = "Skaista vāze!";
33 |
34 | description = "Ļoti skaista vāze";
35 | console.log(description);
36 |
37 | description = "Kaķis";
38 | console.log(description);
39 |
40 | description = 5;
41 | console.log(description);
42 |
43 | // let description;
44 |
45 | let vegetable: string;
46 | // console.log(vegetable);
47 |
48 | vegetable = "Gurķis";
49 | console.log(vegetable);
50 |
51 | // var ----------------------------------------------------------------
52 |
53 | var greeter: string = "hello";
54 | var greeter: string = "hello hello";
55 |
56 | greeter = "hey hi";
57 |
58 | console.log(greeter);
59 |
60 | if (4 < 5) {
61 | var greeter: string = "say Hello instead";
62 | }
63 |
64 | console.log(greeter);
65 |
66 | // String concat ------------------------------------------------------
67 | console.log("Harijs Poters(27) ir burvis");
68 |
69 | const poterName: string = "Harijs Poters";
70 | const poterAge: number = 27;
71 | const poterOccupation: string = "burvis";
72 |
73 | const introFirst: string =
74 | poterName + "(" + poterAge + ")" + " ir " + poterOccupation;
75 | console.log(introFirst);
76 |
77 | const introSecond: string = `${poterName}(${poterAge}) ir ${poterOccupation}`;
78 | console.log(introSecond);
79 |
80 | const introThird: string = poterName.concat(
81 | "(",
82 | "" + poterAge,
83 | ") ir ",
84 | poterOccupation
85 | );
86 | console.log(introThird);
87 |
88 | // String methods) --------------------------------------------------------------
89 |
90 | const id: string = "12345";
91 |
92 | const idAsNumberFirst: number = Number(id);
93 | console.log(idAsNumberFirst);
94 | // console.log(typeof idAsNumberFirst);
95 |
96 | const idAsNumberSecond: number = parseInt(id, 10);
97 | console.log(idAsNumberSecond);
98 | // console.log(typeof idAsNumberSecond);
99 |
100 | const idAsNumberThird: number = +id;
101 | console.log(idAsNumberThird);
102 |
103 | const lowerCaseWord: string = "panna";
104 | const upperCaseWord: string = lowerCaseWord.toUpperCase();
105 | console.log(upperCaseWord);
106 |
107 | const firstChar: string = upperCaseWord.charAt(0);
108 | console.log(firstChar);
109 |
110 | console.log(lowerCaseWord.length);
111 |
112 | const newLowerCaseWord: string = lowerCaseWord.replace("panna", "v");
113 | console.log(newLowerCaseWord);
114 |
115 | const longSentence: string = "Sveiki mani sauc Harijs Poters";
116 | const shortSentence: string = longSentence.slice(17, 30);
117 | console.log(shortSentence);
118 |
119 | const whiteSpaceWord: string = " Hello ";
120 | console.log(whiteSpaceWord);
121 |
122 | const noWhiteSpaceWord: string = whiteSpaceWord.trim();
123 | console.log(noWhiteSpaceWord);
124 |
125 | // Number -------------------------------------------------------------------------
126 | const price: number = 3.96873;
127 | const twenty: number = 20;
128 |
129 | console.log("" + price);
130 | console.log(String(price));
131 | console.log(`${5}`);
132 | console.log(twenty.toString());
133 |
134 | let result: number;
135 |
136 | result = price + twenty;
137 | console.log(result);
138 |
139 | result = price * twenty;
140 | console.log(result);
141 |
142 | result = Math.floor(price);
143 | console.log(result);
144 |
145 | result = Math.round(price);
146 | console.log(result);
147 |
148 | result = Number(price.toFixed(2));
149 | console.log(result);
150 |
151 | let mindBlown: number = 1;
152 |
153 | mindBlown = mindBlown + 1; // 2
154 | console.log(mindBlown);
155 |
156 | mindBlown++; // 3
157 | console.log(mindBlown);
158 |
159 | mindBlown = mindBlown - 1; // 2
160 | console.log(mindBlown);
161 |
162 | mindBlown--; // 1
163 | console.log(mindBlown);
164 |
165 | mindBlown = mindBlown + 7; // 8
166 | console.log(mindBlown);
167 |
168 | mindBlown += 7; // 15
169 | console.log(mindBlown);
170 |
171 | mindBlown -= 7; // 8
172 | console.log(mindBlown);
173 |
174 | mindBlown = mindBlown * 10; //80
175 | console.log(mindBlown);
176 |
177 | mindBlown *= 10; // 800
178 | console.log(mindBlown);
179 |
180 | // Boolean --------------------------------------------------------------------------
181 | const truthyValue: boolean = true;
182 | const falsyValue: boolean = false;
183 |
184 | console.log(Boolean(0)); // false
185 | console.log(Boolean(456)); // true
186 | console.log(Boolean("")); // false
187 | console.log(Boolean("Hello")); // true
188 | console.log(Boolean(undefined)); // false
189 | console.log(Boolean(null)); //false
190 | console.log(Boolean(NaN)); // false
191 |
192 | const dog: string = "Duksis";
193 | console.log(!!dog);
194 | console.log(!!0);
195 | console.log(!!55);
196 |
197 | const comparison: boolean = 7 > 5;
198 | console.log(comparison);
199 |
200 | console.log(10 < 5);
201 |
202 | console.log(100 <= 20);
203 |
204 | console.log(!false);
205 |
206 | const isCat: boolean = false;
207 | const isDog: boolean = !isCat;
208 | console.log(isDog);
209 |
210 | // == and === --------------------------------------------------------
211 |
212 | let five: any = "5";
213 |
214 | console.log(5 == 5);
215 | console.log(five == 5); // true
216 |
217 | console.log(five + 100);
218 |
219 | console.log(5 === 5);
220 | console.log(five === 5);
221 |
222 | const goodDay: string = "Laba diena";
223 | console.log(goodDay.length === 11);
224 | console.log(goodDay.length);
225 |
226 | // Logical operators ------------------------------------------------------------------
227 |
228 | const trueOrTrueBoolean: boolean = Boolean("Friend" || "Enemy");
229 | console.log(trueOrTrueBoolean);
230 |
231 | const trueOrTrueExample: string = "Friend" || "Enemy";
232 | console.log(trueOrTrueExample);
233 |
234 | const trueOrFalseBoolean: boolean = !!("Friend" || undefined);
235 | console.log(trueOrFalseBoolean);
236 |
237 | const trueOrFalseExample: string = "Friend" || undefined;
238 | console.log(trueOrFalseExample);
239 |
240 | const falseOrTrueBoolean: boolean = !!(undefined || "Friend");
241 | console.log(falseOrTrueBoolean);
242 |
243 | const falseOrTrueExample: string = undefined || "Friend";
244 | console.log(falseOrTrueExample);
245 |
246 | const falseOrFalseBoolean: boolean = !!(0 || undefined);
247 | console.log(falseOrFalseBoolean);
248 |
249 | const falseOrFalseExample: number | undefined = 0 || undefined;
250 | console.log(falseOrFalseExample);
251 |
252 | const trueAndTrueBoolean: boolean = !!("Friend" && "Enemy");
253 | console.log(trueAndTrueBoolean);
254 |
255 | const trueAndTrueExample: string = "Friend" && "Enemy";
256 | console.log(trueAndTrueExample);
257 |
258 | // If, else if, else -----------------------------------------------------------------------------
259 | const truth: boolean = true;
260 |
261 | if (truth) {
262 | console.log("Ja ir true, tad notiek šis");
263 | }
264 |
265 | if (!truth) {
266 | console.log("Ja ir false, tad notiek šis");
267 | }
268 |
269 | let time: number = 10;
270 |
271 | if (time > 3 || time < 5) {
272 | console.log("time ir lielāks par 3 vai mazāks par 5");
273 | } else {
274 | console.log("time nav lielāks par 3 un nav mazāks par 5");
275 | }
276 |
277 | if (time) {
278 | console.log("time ir patiesa vērtība");
279 | } else {
280 | console.log("time nav patiesa vērtība");
281 | }
282 |
283 | /* let height: number; // undefined
284 |
285 | if (height) {
286 | console.log("Ir augstums", height);
287 | } else {
288 | height = 5;
289 | }
290 |
291 | console.log(height); */
292 |
293 | const partyTitle: string = "Dzimšanas diena";
294 | const guestCount: number = 10;
295 | let isHappening: boolean;
296 |
297 | if (partyTitle && guestCount > 100) {
298 | isHappening = true;
299 | } else {
300 | isHappening = false;
301 | }
302 |
303 | console.log("Balle notiek", isHappening);
304 |
305 | const gameIsInPogress: boolean = false;
306 | const isGoal: boolean = true;
307 |
308 | if (gameIsInPogress && isGoal) {
309 | console.log("Spēle notiek un ir vārti");
310 | } else if (gameIsInPogress) {
311 | console.log("Spēle notiek, bet vārtu nav");
312 | } else if (isGoal) {
313 | console.log("Spēle nenotiek, bet ir vārti");
314 | } else {
315 | console.log("Spēle nenotiek un vārtu arī nav");
316 | }
317 |
318 | // Ternary operator ---------------------------------------------------------------------
319 | if (10 > 5) {
320 | console.log("Hey");
321 | } else {
322 | console.log("Hi");
323 | }
324 |
325 | 10 > 5 ? console.log("Hey") : console.log("Hi");
326 |
327 | const tomato: string = "Tomāts";
328 | let total: number;
329 |
330 | if (tomato === "Tomāts") {
331 | total = 10;
332 | } else {
333 | total = 0;
334 | }
335 |
336 | total = tomato === "Tomāts" ? 10 : 0;
337 |
338 | console.log(total);
339 |
340 | isHappening = partyTitle && guestCount > 100 ? true : false;
341 |
342 | // Switch statement --------------------------------------------------------------------
343 | let fruit: string = "Apelsīns";
344 |
345 | switch (fruit) {
346 | case "Banāns":
347 | console.log("Tas ir banāns");
348 | break;
349 | case "Mandarīns":
350 | case "Apelsīns":
351 | console.log("Tulīt būs Ziemassvētki");
352 | break;
353 | default:
354 | console.log("Tas nav neviens no dotajiem");
355 | }
356 |
357 | let keyCode: number = 38;
358 |
359 | switch (keyCode) {
360 | case 37:
361 | console.log("Pa kreisi");
362 | break;
363 | case 38:
364 | console.log("Uz augšu");
365 | break;
366 | case 39:
367 | console.log("Pa labi");
368 | break;
369 | case 40:
370 | console.log("Uz leju");
371 | break;
372 | }
373 |
374 | // Arrays --------------------------------------------------------------------
375 |
376 | const fruits: string[] = ["Melone", "Banāns", "Kivī"];
377 | console.log(fruits);
378 | console.log(fruits[0]);
379 | console.log(fruits[1]);
380 | console.log(fruits[fruits.length - 1]);
381 | console.log(fruits.length);
382 | console.log(["Kaķis"] === ["Kaķis"]);
383 | console.log(fruits === fruits);
384 |
385 | fruits.push("Citrons");
386 | console.log(fruits);
387 |
388 | fruits.pop();
389 | console.log(fruits);
390 |
391 | fruits.shift();
392 | console.log(fruits);
393 |
394 | fruits.unshift("Citrons");
395 | console.log(fruits);
396 |
397 | const bananaIndex: number = fruits.indexOf("Banāns");
398 | console.log(bananaIndex);
399 |
400 | fruits.splice(1, 1);
401 | console.log(fruits);
402 |
403 | const fruitsSliced: string[] = fruits.slice(0, 1);
404 | console.log(fruitsSliced);
405 | console.log(fruits);
406 |
407 | const fruitsJoined: string = fruits.join("-");
408 | console.log(fruitsJoined);
409 |
410 | // Spread operator -------------------------------------------------------------------
411 |
412 | const people: string[] = ["Anna", "Baiba", "Jānis", "Pēteris"];
413 | const colors: string[] = ["Red", "Green", "Blue"];
414 |
415 | const colorsCopy: string[] = colors;
416 |
417 | colorsCopy.pop();
418 | console.log(colorsCopy);
419 | console.log(colors);
420 |
421 | const peopleCopy: string[] = [...people];
422 | peopleCopy.pop();
423 | console.log(peopleCopy);
424 | console.log(people);
425 |
426 | const peopleCopySecond: string[] = [...people, "Gatis", "Sabīne"];
427 | console.log(peopleCopySecond);
428 |
429 | const colorsAndPeople: string[] = colors.concat(people);
430 | console.log(colorsAndPeople);
431 |
432 | const colorsAndPeopleSecond: string[] = [...colors, ...people];
433 | console.log(colorsAndPeopleSecond);
434 |
435 | const colorIds: number[] = [1, 2, 3, 4];
436 | const reversedColorIds: number[] = colorIds.reverse();
437 | console.log(reversedColorIds);
438 |
439 | // For loop -------------------------------------------------------------------
440 |
441 | for (let i = 1; i < 6; i++) {
442 | console.log(i);
443 | }
444 |
445 | const n: number = 5;
446 |
447 | for (let i = 1; i <= n; i++) {
448 | console.log("Čau");
449 | }
450 |
451 | const vegetables: string[] = ["Tomāts", "Gurķis", "Kāposts"];
452 |
453 | for (let i = 0; i <= vegetables.length - 1; i++) {
454 | console.log(vegetables[i]);
455 | }
456 |
457 | let sum: number = 0;
458 |
459 | for (let i = 1; i <= 3; i++) {
460 | sum = sum + i;
461 | console.log(sum);
462 | }
463 |
464 | console.log(sum);
465 |
466 | const numbers: number[] = [10, 100, 200, 35, 440, 5];
467 | const bigNumbers: number[] = [];
468 |
469 | for (let i = 0; i < numbers.length; i++) {
470 | if (numbers[i] > 100) {
471 | bigNumbers.push(numbers[i]);
472 | }
473 | }
474 |
475 | console.log(bigNumbers);
476 |
477 | // While, do while loop -----------------------------------------------------------------
478 |
479 | let i: number = 1;
480 |
481 | while (i < 4) {
482 | console.log(i);
483 | i++;
484 | }
485 |
486 | let numberArray: number[] = [];
487 | i = 0;
488 |
489 | while (i <= 4) {
490 | numberArray.push(i);
491 | i++;
492 | }
493 |
494 | console.log(numberArray);
495 |
496 | i = 0;
497 |
498 | do {
499 | numberArray.push(i);
500 | i++;
501 | } while (i <= 10);
502 |
503 | console.log(numberArray);
504 |
505 | i = 0;
506 |
507 | do {
508 | i++;
509 | console.log(i);
510 | } while (i <= 10);
511 |
512 | // Functions ------------------------------------------------------------------------
513 |
514 | logFivePlusSeven();
515 |
516 | function logFivePlusSeven(): void {
517 | console.log(5 + 7);
518 | }
519 |
520 | logFivePlusSeven();
521 | logFivePlusSeven();
522 |
523 | function add(a: number, b: number): number {
524 | return a + b;
525 | }
526 |
527 | const sixPlusNine: number = add(6, 9);
528 | console.log(sixPlusNine);
529 | console.log(add(100, 60));
530 |
531 | function congratulate(name: string, prize: number): void {
532 | const congratsText = `Apsveicam, ${name}. Tu vinnēji ${prize}`;
533 | console.log(congratsText);
534 | }
535 |
536 | congratulate("Hermione", 1000);
537 | congratulate("Hagrids", 5000);
538 |
539 | // sayHello();
540 | const sayHello = function (): void {
541 | console.log("Čau");
542 | };
543 |
544 | sayHello();
545 | sayHello();
546 | sayHello();
547 |
548 | const square = function (a: number): number {
549 | return a * a;
550 | };
551 |
552 | const fiveSquared: number = square(5);
553 | console.log(fiveSquared);
554 | console.log(square(8));
555 |
556 | const halve = function (a: number): number | string {
557 | if (a % 2 === 0) {
558 | return a / 2;
559 | } else {
560 | return "Skaitlis nav pāra";
561 | }
562 | };
563 |
564 | console.log(halve(10));
565 | console.log(halve(13));
566 |
567 | // Arrow functions -----------------------------------------------------------
568 |
569 | function subtractFirst(a: number, b: number): number {
570 | return a - b;
571 | }
572 |
573 | const subtractSecond = function (a: number, b: number): number {
574 | return a - b;
575 | };
576 |
577 | const subtractThird = (a: number, b: number): number => {
578 | return a - b;
579 | };
580 |
581 | const subtractFourth = (a: number, b: number): number => a - b;
582 |
583 | console.log(subtractFourth(20, 8));
584 |
585 | const checkIfContainsCat = (sentence: string): boolean =>
586 | sentence.includes("kaķis");
587 |
588 | console.log(checkIfContainsCat("Man mājās ir kaķis"));
589 | console.log(checkIfContainsCat("Man ir suns"));
590 |
591 | if (checkIfContainsCat("Man ir kaķis")) {
592 | console.log("Ir kaķis");
593 | } else {
594 | console.log("Nav kaķa");
595 | }
596 |
597 | const subtractConditional = (a: number, b: number): number =>
598 | a > b ? a - b : b - a;
599 |
600 | console.log(subtractConditional(10, 6));
601 | console.log(subtractConditional(3, 10));
602 |
603 | const multiply = (a: number, b: number) => a * b;
604 | console.log(multiply(3, 2));
605 |
606 | const humanNames: string[] = ["Baiba", "Aija", "Centis"];
607 |
608 | const getFirstLetters = (names: string[]): string => {
609 | let result: string = "";
610 |
611 | names.forEach((name) => {
612 | result = result + name.charAt(0);
613 | });
614 |
615 | return result;
616 | };
617 |
618 | console.log(getFirstLetters(humanNames));
619 |
620 | // Objects ----------------------------------------------------------
621 |
622 | interface Person {
623 | id: number;
624 | name: string;
625 | "last-name": string;
626 | isWizard: boolean;
627 | friends: string[];
628 | contactInfo: ContactInfo;
629 | enemies: Enemy[];
630 | sayHi: () => void;
631 | }
632 |
633 | interface ContactInfo {
634 | email: string;
635 | phone: string;
636 | }
637 |
638 | interface Enemy {
639 | id: number;
640 | name: string;
641 | }
642 |
643 | const person: Person = {
644 | id: 1,
645 | name: "Harijs",
646 | "last-name": "Poters",
647 | isWizard: true,
648 | friends: ["Hermione", "Rons", "Hagrids"],
649 | contactInfo: {
650 | email: "badass.wizard@inbox.lv",
651 | phone: "222 333 444",
652 | },
653 | enemies: [
654 | {
655 | id: 1,
656 | name: "Voldemors",
657 | },
658 | ],
659 | sayHi: () => console.log("Čau"),
660 | };
661 |
662 | console.log(person.name);
663 | console.log(person.id);
664 | console.log(person.friends);
665 | console.log(person.contactInfo.email);
666 | console.log(person.enemies[0].name);
667 | console.log(person["last-name"]);
668 |
669 | person.sayHi();
670 |
671 | // Object methods --------------------------------------------------------------
672 |
673 | interface BlogPost {
674 | id: number;
675 | title: string;
676 | description: string;
677 | rating?: number;
678 | }
679 |
680 | const blogPost: BlogPost = {
681 | id: 1,
682 | title: "Labākā diena šogad",
683 | description: "Šodien bija mana dzimšanas diena",
684 | };
685 |
686 | const blogKeys: string[] = Object.keys(blogPost);
687 | console.log(blogKeys);
688 |
689 | const blogValues: (string | number)[] = Object.values(blogPost);
690 | console.log(blogValues);
691 |
692 | const blogEntries: (string | number)[][] = Object.entries(blogPost);
693 | console.log(blogEntries);
694 |
695 | console.log({} === {});
696 | console.log(blogPost === blogPost);
697 |
698 | blogPost.title = "Laba diena";
699 | console.log(blogPost);
700 |
701 | const blogPostCopy: BlogPost = { ...blogPost, rating: 7.5 };
702 | console.log(blogPostCopy);
703 |
704 | blogPost.rating = 9.5;
705 | console.log(blogPost);
706 |
707 | // map() -------------------------------------------------------------
708 |
709 | const naturalNumbers: number[] = [1, 2, 3];
710 | let doubles: number[] = [];
711 |
712 | for (let i = 0; i < naturalNumbers.length; i++) {
713 | doubles.push(naturalNumbers[i] * 2);
714 | }
715 |
716 | console.log(doubles);
717 |
718 | doubles = naturalNumbers.map((it) => it * 2);
719 | console.log(doubles);
720 |
721 | const triples: number[] = naturalNumbers.map((it) => it * 3);
722 | console.log(triples);
723 |
724 | const alphabet: string[] = ["A", "B", "C", "D"];
725 |
726 | const alphabetSmall: string[] = alphabet.map((letter) => letter.toLowerCase());
727 |
728 | console.log(alphabetSmall);
729 |
730 | interface Player {
731 | name: string;
732 | wins: number;
733 | losses: number;
734 | score?: number;
735 | }
736 |
737 | const players: Player[] = [
738 | {
739 | name: "Bonija",
740 | wins: 5,
741 | losses: 2,
742 | },
743 | {
744 | name: "Klaids",
745 | wins: 6,
746 | losses: 5,
747 | },
748 | ];
749 |
750 | const playerNames: string[] = players.map((player) => player.name);
751 | console.log(playerNames);
752 |
753 | const playerWins: number[] = players.map((player) => player.wins);
754 | console.log(playerWins);
755 |
756 | const playersWithScore: Player[] = players.map((player) => {
757 | return { ...player, score: player.wins - player.losses };
758 | });
759 | console.log(playersWithScore);
760 |
761 | // Filter --------------------------------------------------------------------
762 |
763 | const randomNumbers: number[] = [45, 28, 1, 2, 3, 100];
764 |
765 | const randomNumbersFiltered: number[] = randomNumbers.filter((randomNumber) => {
766 | return randomNumber > 5;
767 | });
768 | console.log(randomNumbersFiltered);
769 |
770 | const words: string[] = ["Limits", "Elite", "Saulessargs", "Lietussargs"];
771 |
772 | const longWords: string[] = words.filter((word) => word.length > 6);
773 | console.log(longWords);
774 |
775 | interface ShopItem {
776 | id: number;
777 | title: string;
778 | isAvailable: boolean;
779 | type: string;
780 | }
781 |
782 | const shopItems: ShopItem[] = [
783 | {
784 | id: 1,
785 | title: "Grāmata",
786 | isAvailable: false,
787 | type: "books",
788 | },
789 | {
790 | id: 2,
791 | title: "Televizors",
792 | isAvailable: true,
793 | type: "electronics",
794 | },
795 | ];
796 |
797 | const findShopItems: ShopItem[] = shopItems.filter(
798 | (shopItem) => shopItem.id !== 1
799 | );
800 | console.log(findShopItems);
801 |
802 | const availableItems: ShopItem[] = shopItems.filter(
803 | (shopItem) => shopItem.isAvailable === true
804 | );
805 | console.log(availableItems);
806 |
807 | // forEach() ----------------------------------------------------------------------------
808 |
809 | const smallLetters: string[] = ["a", "b", "c"];
810 |
811 | for (let i = 0; i < smallLetters.length; i++) {
812 | console.log(smallLetters[i]);
813 | }
814 |
815 | smallLetters.forEach((letter) => console.log(letter));
816 |
817 | interface FoodItem {
818 | name: string;
819 | ingredients: string[];
820 | }
821 |
822 | const foodItems: FoodItem[] = [
823 | { name: "Pica", ingredients: ["Mīkla", "Kečups", "Siers"] },
824 | { name: "Burgeris", ingredients: ["Maize", "Kotlete"] },
825 | { name: "Pasta", ingredients: ["Makaroni"] },
826 | ];
827 |
828 | foodItems.forEach((foodItem, i) => {
829 | console.log("Indekss", i, "Nosaukums", foodItem.name);
830 | });
831 |
832 | for (let i = 0; i < foodItems.length; i++) {
833 | const food = foodItems[i];
834 | for (let j = 0; j < food.ingredients.length; j++) {
835 | const ingredient = food.ingredients[j];
836 | console.log(ingredient);
837 | }
838 | }
839 |
840 | foodItems.forEach((foodItem) => {
841 | foodItem.ingredients.forEach((ingredient) => {
842 | console.log(ingredient);
843 | });
844 | });
845 |
846 | // sort(), find(), findIndex() ------------------------------------------------------
847 |
848 | const heroes: string[] = ["Supermens", "Betmens", "Akvamens"];
849 | // heroes.sort();
850 | console.log(heroes);
851 |
852 | const sortedHeroes: string[] = [...heroes].sort();
853 | console.log(heroes);
854 | console.log(sortedHeroes);
855 |
856 | const heroIds: number[] = [10, 5, 11, 25];
857 | heroIds.sort();
858 | console.log(heroIds);
859 |
860 | heroIds.sort((a, b) => a - b);
861 | console.log(heroIds);
862 |
863 | heroIds.sort((a, b) => b - a);
864 | console.log(heroIds);
865 |
866 | const batmanIndex: number = heroes.indexOf("Betmeens");
867 | console.log(batmanIndex);
868 |
869 | interface Human {
870 | name: string;
871 | age: number;
872 | }
873 |
874 | const humans: Human[] = [
875 | { name: "Edward", age: 107 },
876 | { name: "Jacob", age: 15 },
877 | { name: "Bella", age: 17 },
878 | ];
879 |
880 | humans.sort((a, b) => a.age - b.age);
881 |
882 | console.log(humans);
883 |
884 | const edward: Human | undefined = humans.find(
885 | (human) => human.name === "Edward"
886 | );
887 |
888 | console.log(edward);
889 |
890 | const bellaIndex: number = humans.findIndex((human) => human.name === "Bella");
891 |
892 | console.log(bellaIndex);
893 |
--------------------------------------------------------------------------------
/tsconfig.json:
--------------------------------------------------------------------------------
1 | {
2 | "compilerOptions": {
3 | "target": "es2021" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
4 | "module": "commonjs" /* Specify what module code is generated. */,
5 | "esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */,
6 | "forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,
7 | "strict": true /* Enable all strict type-checking options. */,
8 | "skipLibCheck": true /* Skip type checking all .d.ts files. */
9 | }
10 | }
11 |
--------------------------------------------------------------------------------