Implement three solutions for solving reverse string problem, write tests

Author: somekindofwallflower

01_reverse_string/index.js

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+// --- Directions
+// Given a string, return a new string with the reversed
+// order of characters
+// --- Examples
+//   reverse('apple') === 'leppa'
+//   reverse('hello') === 'olleh'
+//   reverse('Greetings!') === '!sgniteerG'
+
+
+// Solution 1
+// function reverse(str) {
+//     return str.split('').reverse().join('');
+// }
+
+
+// // Solution 2
+// function reverse(str) {
+//     let reversed = "";
+//     for(let character of str) {
+//         reversed = character + reversed;
+//     }
+//     return reversed;
+// }
+
+// Solution 3
+function reverse(str) {
+    return str.split("").reduce((rev, char) =>  char + rev, "")
+}
+
+
+module.exports = reverse;

01_reverse_string/test.js

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+const reverse = require('./index');
+
+test('Reverse function exists', () => {
+    expect(reverse).toBeDefined();
+});
+
+test('Reverse reverses a string', () => {
+    expect(reverse('abcd')).toEqual('dcba');
+});
+
+test('Reverse reverses a string', () => {
+    expect(reverse('  abcd')).toEqual('dcba  ');
+});