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cjavdev's solution

to Reverse String in the JavaScript Track

Published at Mar 11 2019 · 0 comments
Test suite


This exercise has changed since this solution was written.

Reverse a string

For example: input: "cool" output: "looc"


Go through the setup instructions for Javascript to install the necessary dependencies:



Install assignment dependencies:

$ npm install

Making the test suite pass

Execute the tests with:

$ npm test

In the test suites all tests but the first have been skipped.

Once you get a test passing, you can enable the next one by changing xtest to test.


Introductory challenge to reverse an input string https://medium.freecodecamp.org/how-to-reverse-a-string-in-javascript-in-3-different-ways-75e4763c68cb

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.


import { reverseString } from './reverse-string';

describe('ReverseString', () => {
  test('empty string', () => {
    const expected = '';
    const actual = reverseString('');

  xtest('a word', () => {
    const expected = 'tobor';
    const actual = reverseString('robot');

  xtest('a capitalized word', () => {
    const expected = 'nemaR';
    const actual = reverseString('Ramen');

  xtest('a sentence with punctuation', () => {
    const expected = '!yrgnuh ma I';
    const actual = reverseString('I am hungry!');

  xtest('a palindrome', () => {
    const expected = 'racecar';
    const actual = reverseString('racecar');
export function reverseString(input) {
  var output = [];
  for(var i = 0; i < input.length; i++) {
    output.push(input[input.length - 1 - i]);
  return output.join("");

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