lab tasks 1, 2, 3, 4, 5, 6, 7, 8, 9, a

Exercises.ru.md

@@ -14,7 +14,7 @@
 отдает массив нечетных чисел из диапазона [15, 30] включая крайние числа.
 
 ## Функции
-
+~~~~
 6. Вложенные вызовы функций в цикле
 - Реализуйте функцию `average` с сигнатурой
 `average(a: number, b: number): number` вычисляющую среднее арифметическое своих

Exercises/1-let.js

@@ -1,5 +1,7 @@
 'use strict';
+//
+let name = 'Don Kihot';
+//
+module.exports = { name };
 
-let name = undefined;
 
-module.exports = { name };

Exercises/2-const.js

@@ -1,5 +1,5 @@
 'use strict';
 
-const year = undefined;
+const year = 1917;
 
 module.exports = { year };

Exercises/3-hello.js

@@ -1,5 +1,5 @@
 'use strict';
 
-const hello = null;
+const hello = name => console.log(`Hello, ${name}!`);
 
 module.exports = { hello };

Exercises/4-range.js

@@ -1,5 +1,18 @@
 'use strict';
 
-const range = null;
+
+const range = (start, end) => {
+  const arr = [];
+  const length = end - start;
+
+  for (let i = 0; i <= length; i++) {
+    arr[i] = start;
+    start++;
+  }
+
+  return arr;
+};
+
+
 
 module.exports = { range };

Exercises/5-range-odd.js

@@ -1,5 +1,16 @@
 'use strict';
 
-const rangeOdd = null;
+const rangeOdd = (begin, end) => {
+  const len = Math.ceil((end - begin) / 2);
+  if (len < 0) return [];
+  const array = new Array(len);
+  let i = 0;
+  for (let n = begin; n <= end; n++) {
+    if (n % 2 !== 0) array[i++] = n;
+  }
+  return array;
+};
+
 
 module.exports = { rangeOdd };
+

Exercises/6-calculate.js

@@ -1,11 +1,19 @@
 'use strict';
 
-const square = null;
+const square = n => n * n;
 
-const cube = null;
+const cube = n => n ** 3;
 
-const average = null;
+const average = (a, b) => (a + b) / 2;
+
+const calculate = () => {
+  const arr = [];
+  for (let i = 0; i <= 9; i++) {
+    const calc = average(square(i), cube(i));
+    arr.push(calc);
+  }
+  return arr;
+};
 
-const calculate = null;
 
 module.exports = { square, cube, average, calculate };

Exercises/7-objects.js

@@ -1,5 +1,15 @@
 'use strict';
 
-const fn = null;
+const fn = () => {
+  const name1 = { name: 'John' };
+  let name2 = { name: 'John' };
+
+  name1.name = 'Dou';
+  name2.name = 'Dou';
+
+  name2 = { name: 'John Dou' };
+};
+
+
 
 module.exports = { fn };

Exercises/8-create.js

@@ -1,5 +1,8 @@
 'use strict';
 
-const createUser = null;
+const createUser = (name, city) => ({ name, city });
+
+console.log(createUser('John Dou', 'Rome'));
+
 
 module.exports = { createUser };

Exercises/9-array.js

@@ -1,7 +1,13 @@
 'use strict';
 
-const phonebook = null;
+const phonebook = [
+  { name: 'Marcus Aurelius', phone: '+380445554-433' },
+  { name: 'Mao Zedong', phone: '+380445554-722' },
+  { name: 'Rene Descartes', phone: '+380445554-988' },
+];
 
-const findPhoneByName = null;
+const findPhoneByName = name => {
+  for (const number of phonebook) number.name === name ? number.phone : null;
+};
 
 module.exports = { phonebook, findPhoneByName };

Exercises/a-hash.js

@@ -1,7 +1,11 @@
 'use strict';
 
-const phonebook = null;
+const phonebook = {
+  MarcusAurelius: { phone: '+380445554-433' },
+  MaoZedong: { phone: '+380445554-722' },
+  ReneDescartes: { phone: '+380445554-988' },
+};
 
-const findPhoneByName = null;
+const findPhoneByName = name => phonebook[name];
 
 module.exports = { phonebook, findPhoneByName };