Avatar of 4d47

4d47's solution

to Reverse String in the JavaScript Track

Published at Jul 13 2018 · 0 comments
Test suite


This solution was written on an old version of Exercism. The tests below might not correspond to the solution code, and the exercise may have changed since this code 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 default function(s) {
    return [...s].reverse().join('')

Community comments

Find this solution interesting? Ask the author a question to learn more.

What can you learn from this solution?

A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

  • What compromises have been made?
  • Are there new concepts here that you could read more about to improve your understanding?