Async-await, generators, Map API, Set API and Jest test

.gitignore

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+./node_modules

Week-5/Ex-5.1.js

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+async function doTask1() {
+    let promise = new Promise((resolve, reject) => {
+        setTimeout(() => {
+            resolve('Task 1 completed.');
+        }, 1000);
+    });
+    const response = await promise;
+    console.log(response);
+}
+
+async function doTask2() {
+    let promise = new Promise((resolve, reject) => {
+        setTimeout(() => {
+            resolve('Task 2 completed.');
+        }, 5000);
+    });
+    const response = await promise;
+    console.log(response);
+}
+
+async function doTask3() {
+    let promise = new Promise((resolve, reject) => {
+        setTimeout(() => {
+            resolve('Task 3 completed.');
+        }, 3000);
+    });
+    const response = await promise;
+    console.log(response);
+}
+
+async function allTask() {
+    await doTask1();
+    await doTask2();
+    await doTask3();
+}
+
+function* genFunc() {
+    yield doTask1();
+    yield doTask2();
+    yield doTask3();
+}
+
+//   allTask();
+const genTaskFunc = genFunc();
+genTaskFunc.next();
+genTaskFunc.next();
+genTaskFunc.next();
+
+

Week-5/Ex-5.2.js

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+function isVowel(char) {
+    let vowel = 'aeiou';
+    return vowel.includes(char);
+}
+
+function vowelcount(str) {
+    const vowelMap = new Map();
+    for(let char of str) {
+        let lowercaseChar = char.toLowerCase();
+        if (isVowel(lowercaseChar)) {
+            if(vowelMap.has(lowercaseChar)) {
+                vowelMap.set(lowercaseChar, vowelMap.get(lowercaseChar) + 1);
+            } else {
+                vowelMap.set(lowercaseChar, 1);
+            }
+        }
+    }
+    return vowelMap;
+}
+
+console.log(vowelcount('encyclopaedia')); //Map(4) { 'e' => 2, 'o' => 1, 'a' => 2, 'i' => 1 }

Week-5/Ex-5.3.js

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+const hasDuplicate = arr =>  new Set(arr).size !== arr.length;
+
+console.log(hasDuplicate([1, 5, -1, 4, 1, 4])); //true
+
+console.log(hasDuplicate([1, 5, -1, 4])); //false

Week-5/Ex-5.4-operation.js

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+const mathOperations = {
+    sum: function(a,b) {
+        return a + b;
+    },
+    diff: function(a,b) {
+        return a - b;
+    },
+    product: function(a,b) {
+        return a * b
+    }
+};
+
+module.exports = mathOperations;

Week-5/operation.test.js

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+const mathOperations  = require('./Ex-5.4-operation');
+
+describe('Tests', () => {
+    test('Add Operation', () => {
+        expect(mathOperations.sum(1, 2)).toBe(3);
+    });
+
+    test('Subtraction Operation', () => {
+        expect(mathOperations.diff(10, 2)).toBe(8);
+    });
+
+    test('Multiplication Operation', () => {
+        expect(mathOperations.product(3, 2)).toBe(6);
+    });
+})