--update : counting vowels

Author: ashokdey

src/count-vowels/count-vowels.test.js

@@ -0,0 +1,49 @@
+const { countVowelsItteratively, countVowelsItterativelyES6, countVowelsUsingRegex } = require('.');
+
+describe('Count Vowels', () => {
+  const apple = 'AppLe';
+  const education = 'education';
+  const myths = 'myths';
+
+  describe('Count by regular itteration', () => {
+    it('Should return 2 for `Apple`', () => {
+      expect(countVowelsItteratively(apple)).toEqual(2);
+    });
+
+    it('Should return 5 for `Education`', () => {
+      expect(countVowelsItteratively(education)).toEqual(5);
+    });
+
+    it('Should return 0 for `Myths`', () => {
+      expect(countVowelsItteratively(myths)).toEqual(0);
+    });
+  });
+
+  describe('Count by ES6 itteration', () => {
+    it('Should return 2 for `Apple`', () => {
+      expect(countVowelsItterativelyES6(apple)).toEqual(2);
+    });
+
+    it('Should return 5 for `Education`', () => {
+      expect(countVowelsItterativelyES6(education)).toEqual(5);
+    });
+
+    it('Should return 0 for `Myths`', () => {
+      expect(countVowelsItterativelyES6(myths)).toEqual(0);
+    });
+  });
+
+  describe('Count using REGEX', () => {
+    it('Should return 2 for `Apple`', () => {
+      expect(countVowelsUsingRegex(apple)).toEqual(2);
+    });
+
+    it('Should return 5 for `Education`', () => {
+      expect(countVowelsUsingRegex(education)).toEqual(5);
+    });
+
+    it('Should return 0 for `Myths`', () => {
+      expect(countVowelsUsingRegex(myths)).toEqual(0);
+    });
+  });
+});

src/count-vowels/index.js

@@ -0,0 +1,40 @@
+const pattern = /[^\w]/g;
+
+const cleanString = str => str.replace(pattern, '').toLowerCase();
+const isVowel = char => char === 'a' || char === 'e' || char === 'i' || char === 'o' || char === 'u';
+
+function countVowelsItteratively(str) {
+  const cleanedString = cleanString(str);
+  let count = 0;
+  for (let i = 0; i < cleanedString.length; i += 1) {
+    if (isVowel(cleanedString[i])) {
+      count += 1;
+    }
+  }
+  return count;
+}
+
+function countVowelsItterativelyES6(str) {
+  const cleanedString = cleanString(str);
+  const vowels = ['a', 'e', 'i', 'o', 'u'];
+  let count = 0;
+
+  // eslint-disable-next-line no-restricted-syntax
+  for (const char of cleanedString) {
+    if (vowels.includes(char)) {
+      count += 1;
+    }
+  }
+  return count;
+}
+
+function countVowelsUsingRegex(str) {
+  const match = str.match(/[aeiou]/gi);
+  return match ? match.length : 0;
+}
+
+module.exports = {
+  countVowelsItteratively,
+  countVowelsItterativelyES6,
+  countVowelsUsingRegex,
+};