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4d47's solution

to Reverse String (Legacy) in the JavaScript Track

Instructions
Test suite
Solution

Reverse String

Reverse a string

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

Setup

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

http://exercism.io/languages/javascript/installation

Running the test suite

The provided test suite uses Jasmine. You can install it by opening a terminal window and running the following command:

npm install -g jasmine

Run the test suite from the exercise directory with:

jasmine reverse-string.spec.js

In many test suites all but the first test have been marked "pending". Once you get a test passing, activate the next one by changing xit to it.

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

var reverseString = require('./reverse-string');

describe('ReverseString', function () {
  it('empty string', function () {
    var expected = '';
    var actual = reverseString('');
    expect(actual).toEqual(expected);
  });

  xit('a word', function () {
    var expected = 'tobor';
    var actual = reverseString('robot');
    expect(actual).toEqual(expected);
  });

  xit('a capitalized word', function () {
    var expected = 'nemaR';
    var actual = reverseString('Ramen');
    expect(actual).toEqual(expected);
  });

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

  xit('a palindrome', function () {
    var expected = 'racecar';
    var actual = reverseString('racecar');
    expect(actual).toEqual(expected);
  });
});
module.exports =

function(s) {
  return Array.from(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?

Community comments

See what others have said about this solution
7 months ago
4d47 says

Found that Array.from(s) is more readable than s.split()