How do you reverse a string in place in JavaScript?

Question

How do you reverse a string in place (or in-place) in JavaScript when it is passed to a function with a return statement, without using built-in functions (.reverse()<

Answer 1

There are many ways you can reverse a string in JavaScript. I'm jotting down three ways I prefer.

Approach 1: Using reverse function:

function reverse(str) {
  return str.split('').reverse().join('');
}

Approach 2: Looping through characters:

function reverse(str) {
  let reversed = '';

  for (let character of str) {
    reversed = character + reversed;
  }

  return reversed;
}

Approach 3: Using reduce function:

function reverse(str) {
  return str.split('').reduce((rev, char) => char + rev, '');
}

I hope this helps :)