All tasks

Exercises/1-let.js

@@ -1,5 +1,5 @@
 'use strict';
 
-let name = undefined;
+let name = 'Aleksey';
 
 module.exports = { name };

Exercises/2-const.js

@@ -1,5 +1,5 @@
 'use strict';
 
-const year = undefined;
+const year = 1988;
 
 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 +1,11 @@
 'use strict';
 
-const range = null;
+const range = (start, end) => {
+  const res = [];
+  for (let i = start; i <= end; i += 1) {
+    res.push(i);
+  }
+  return res;
+};
 
 module.exports = { range };

Exercises/5-range-odd.js

@@ -1,5 +1,13 @@
 'use strict';
 
-const rangeOdd = null;
+const rangeOdd = (start, end) => {
+  const res = [];
+
+  for (let i = start; i <= end; i += 1) {
+    if (i % 2) res.push(i);
+  }
+
+  return res;
+};
 
 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 = null;
+const calculate = () => {
+  const res = [];
+
+  for (let i = 0; i < 10; i += 1) {
+    res.push(average(square(i), cube(i)));
+  }
+
+  return res;
+};
 
 module.exports = { square, cube, average, calculate };

Exercises/7-objects.js

@@ -1,5 +1,14 @@
 'use strict';
 
-const fn = null;
+const fn = () => {
+  let obj = { name: 'name' };
+  const obj2 = { name: 'name' };
+
+  obj.name = 'pavel';
+  obj2.name = 'pavel';
+
+  const obj3 = { name: 'Sergey' };
+  obj = obj3;
+};
 
 module.exports = { fn };

Exercises/8-create.js

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

Exercises/9-array.js

@@ -1,7 +1,14 @@
 'use strict';
 
-const phonebook = null;
+const phonebook = [
+  { name: 'Aleksey', phone: '1234567890' },
+  { name: 'Pavel', phone: '0987654321' },
+];
 
-const findPhoneByName = null;
+const findPhoneByName = name => {
+  for (const p of phonebook) {
+    return p.name === name ? p.phone : null;
+  }
+};
 
 module.exports = { phonebook, findPhoneByName };

Exercises/a-hash.js

@@ -1,7 +1,10 @@
 'use strict';
 
-const phonebook = null;
+const phonebook = {
+  Aleksey: '1234567890',
+  Pavel: '0987654321'
+};
 
-const findPhoneByName = null;
+const findPhoneByName = name => phonebook[name];
 
 module.exports = { phonebook, findPhoneByName };