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4d47's solution

to Reverse String in the JavaScript Track

Instructions
Test suite
Solution

Reverse a string

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

Setup

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

http://exercism.io/languages/ecmascript

Requirements

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.

Source

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.

reverse-string.spec.js

import reverseString from './reverse-string';

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

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

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

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

  xtest('a palindrome', () => {
    const expected = 'racecar';
    const actual = reverseString('racecar');
    expect(actual).toEqual(expected);
  });
});
export default function(s) {
    return [...s].reverse().join('')
}

What can you learn from this solution?

A huge amount can be learnt 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 I could read more about to develop my understanding?