All tasks are done

Exercises/1-let.js

@@ -2,6 +2,6 @@
 
 // Define variable to store your name as a string
 
-let name = undefined;
+let name = 'Denis';
 
 module.exports = { name };

Exercises/2-const.js

@@ -2,6 +2,6 @@
 
 // Define constant to store your birth year as a number
 
-const year = undefined;
+const year = 1980;
 
 module.exports = { year };

Exercises/3-hello.js

@@ -2,6 +2,6 @@
 
 // Prepare function to print greeting with single argument
 
-const hello = null;
+const hello = (name) => console.log(`Hello ${name}!`);
 
 module.exports = { hello };

Exercises/4-range.js

@@ -3,6 +3,15 @@
 // Implement function `range(start: number, end: number): array` returning
 // array with all numbers from the range [15, 30] including endpoints
 
-const range = null;
+const range = (start, end) => {
+  const result = [];
+  for (let i = start; i <= end; i++) {
+    result.push(i);
+  }
+  return result;
+};
+
+// const result = range(1, 10);
+// console.log({ result });
 
 module.exports = { range };

Exercises/5-range-odd.js

@@ -3,6 +3,13 @@
 // Implement function `rangeOdd(start: number, end: number)` returning
 // array with all odd numbers from the range [15, 30] including endpoints
 
-const rangeOdd = null;
+const rangeOdd = (start, end) => {
+  const result = [];
+  for (let i = start; i <= end; i++) {
+    if (i % 2 === 0) continue;
+    result.push(i);
+  }
+  return result;
+};
 
 module.exports = { rangeOdd };

Exercises/6-calculate.js

@@ -16,12 +16,18 @@
 Call functions `square` and `cube` in loop, then pass their
 results to function `average`. Print what `average` returns. */
 
-const square = null;
+const square = (x) => x * x;
 
-const cube = null;
+const cube = (x) => x ** 3;
 
-const average = null;
+const average = (a, b) => (a + b) / 2;
 
-const calculate = null;
+const calculate = () => {
+  const result = [];
+  for (let i = 0; i < 10; i++) {
+    result.push(average(square(i), cube(i)));
+  }
+  return result;
+};
 
 module.exports = { square, cube, average, calculate };

Exercises/7-objects.js

@@ -7,6 +7,19 @@
 - Try to assign other object to both identifiers.
 - Explain script behaviour. */
 
-const fn = null;
+const fn = () => {
+  const obj1 = {
+    name: 'Denis',
+  };
+  let obj2 = {
+    name: 'Milana',
+  };
+  obj1.name = 'Vasia';
+  obj2.name = 'Alisa';
+  //obj1 = {};
+  obj2 = {};
+};
+
+
 
 module.exports = { fn };

Exercises/8-create.js

@@ -5,6 +5,6 @@
   Example: `createUser('Marcus Aurelius', 'Roma')`
   will return object `{ name: 'Marcus Aurelius', city: 'Roma' }` */
 
-const createUser = null;
+const createUser = (name, city) => ({ name, city });
 
 module.exports = { createUser };

Exercises/9-array.js

@@ -9,8 +9,20 @@ Object example: `{ name: 'Marcus Aurelius', phone: '+380445554433' }`.
 `findPhoneByName(name: string): string`. Returning phone from that object
 where field `name` equals argument `name`. Use `for` loop for this search. */
 
-const phonebook = null;
+const phonebook = [
+  { name: 'Marcus Aurelius', phone: '+380445554433' },
+  { name: 'Denis Vasilenko', phone: '+79673196182' },
+  { name: 'Milane Ganeeva', phone: '+78934832938' },
+];
+
+const findPhoneByName = (name) => {
+  for (const user of phonebook) {
+    if (user.name === name) return user.phone;
+  }
+};
+
+console.log(findPhoneByName('Denis Vasilenko'));
+
 
-const findPhoneByName = null;
 
 module.exports = { phonebook, findPhoneByName };

Exercises/a-hash.js

@@ -7,8 +7,11 @@ contains `phone`.
 `findPhoneByName(name: string): string`. Returning phone from hash/object.
 Use `hash[key]` to find needed phone. */
 
-const phonebook = null;
+const phonebook = {
+  Marcus: '+380445554433',
+  Denis: '+79673196182',
+};
 
-const findPhoneByName = null;
+const findPhoneByName = (name) => phonebook[name];
 
 module.exports = { phonebook, findPhoneByName };

JavaScript/2-loop.js

@@ -4,6 +4,6 @@ const MAX_VALUE = 10;
 
 console.log('Begin');
 for (let i = 0; i < MAX_VALUE; i++) {
-  console.dir({ i, date: new Date() });
+  console.dir({ counter: i, date: new Date() });
 }
 console.log('The end');