LABS 1-9, a

Exercises/1-let.js

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

Exercises/2-const.js

@@ -1,5 +1,5 @@
 'use strict';
 
-const year = undefined;
+const year = 1983;
 
 module.exports = { year };

Exercises/3-hello.js

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

Exercises/4-range.js

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

Exercises/5-range-odd.js

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

Exercises/6-calculate.js

@@ -1,11 +1,18 @@
 'use strict';
 
-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 arr = [];
+  for (let i = 0; i <= 9; i++) {
+    const av = average(square(i), cube(i));
+    arr.push(av);
+  }
+  return arr;
+};
 
 module.exports = { square, cube, average, calculate };

Exercises/7-objects.js

@@ -1,5 +1,14 @@
 'use strict';
 
-const fn = null;
-
+const fn = () => {
+  const objOne = { name: 'One' };
+  let objTwo = { name: 'Two' };
+  objOne.name = 'something';
+  objTwo.name = 'something too';
+  //objOne = {other: 3} ;
+  objTwo = { otherTwo: 2 };
+  /*objOne - const => другой объект присвоить нельзя,
+  изменять поля можно у обоих объектов*/
+};
+fn();
 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: 'Marcus', phone: '+380445554433' },
+  { name: 'Vasya', phone: '+38454545454' },
+];
 
-const findPhoneByName = null;
+const findPhoneByName = name => {
+  for (const rec of phonebook) {
+    if (rec.name === name) return rec.phone;
+  }
+};
 
 module.exports = { phonebook, findPhoneByName };

Exercises/a-hash.js

@@ -1,7 +1,10 @@
 'use strict';
 
-const phonebook = null;
+const phonebook = {
+  Marcus: '+380445554433',
+  Vasya: '+38454545454',
+};
 
-const findPhoneByName = null;
+const findPhoneByName = name => phonebook[name];
 
 module.exports = { phonebook, findPhoneByName };