feat: string reversal algorithm

Author: francislagares

src/algorithms/string-reverse/string-reverse.ts

@@ -0,0 +1,19 @@
+export const reverseString = (text: string) => {
+  return Array.from(text).reverse().join('');
+};
+
+export const reverseWithLoop = (text: string) => {
+  let reversed = '';
+
+  for (const character of text) {
+    reversed = character + reversed;
+  }
+
+  return reversed;
+};
+
+export const reverseWithReduce = (text: string) => {
+  return text
+    .split('')
+    .reduce((reversed, character) => character + reversed, '');
+};

src/algorithms/string-reverse/tests/string-reverse.test.ts

@@ -0,0 +1,24 @@
+import { describe, test } from 'vitest';
+import {
+  reverseString,
+  reverseWithLoop,
+  reverseWithReduce,
+} from '../string-reverse';
+
+describe('String Reversal', () => {
+  test('Reverse function exists', () => {
+    expect([reverseString, reverseWithLoop, reverseWithReduce]).toBeDefined();
+  });
+
+  test('Reverse reverses a string', () => {
+    expect(reverseString('abcd')).toEqual('dcba');
+    expect(reverseWithLoop('abcd')).toEqual('dcba');
+    expect(reverseWithReduce('abcd')).toEqual('dcba');
+  });
+
+  test('Reverse reverses a string', () => {
+    expect(reverseString('  abcd')).toEqual('dcba  ');
+    expect(reverseWithLoop('  abcd')).toEqual('dcba  ');
+    expect(reverseWithReduce('  abcd')).toEqual('dcba  ');
+  });
+});