by Sai gowtham

How to reverse a string in JavaScript

In this tutorial, we are going to learn three different ways to reverse a string in JavaScript by using the reverse() method, reduce() method, while loop.

Reversing the string

To reverse a string in JavaScript, we can use the combination of split(), reverse() and join('')methods.

Here is an example:

const str = "hello"
const reverse = str.split('').reverse().join('');

console.log(reverse); // "olleh"

In the above example, we used the split() method to split the given string into an array of individual characters then chain it to reverse(), join() methods.

split(): The split() splits the given string into an array of individual characters.

reverse(): The reverse() method reverses the array.

join(): The join() method joins the array of individual characters into a string.

Using reduce() method

To reverse a string , we can use the reduce() method in JavaScript.

const str = "hello"
const reverse = [...str].reduce((prev,next) => next+prev);

console.log(reverse); // "olleh"

In the example above, first we unpack the string into a array of individual characters using spread operator (…) then we reverses the string using the reduce() method.

Using while loop

function reverseString(str){

  const arr = [...str];
  let reverse= "";

  while(arr.length){
    // joining the reversed string
     reverse = reverse + arr.pop();
  }

  return reverse;
}

console.log(reverseString('hi')); // ih

I mostly like the Second way to reverse a string using reduce() method.

Happy coding…

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