How to shuffle an array - JavaScript

In this article we will learn how to shuffle an array in JavaScript.

It is very common to shuffle an array in JavaScript in JavaScript.

Problem

Now we have a problem, which is that we want to shuffle an array.

Imagine you have a array like this:

[1, 2, 3, 4, 5];

And we want to shuffle an array to became output like this:

// Shuffle more than once
[2, 1, 5, 4, 3];
[1, 1, 4, 3, 5];
[4, 5, 3, 1, 2];

How to solve this problem

To solve this problem we will use Fisher-Yates shuffle algorithm.

Solution:

As we said before, we can solve this problem using Fisher-Yates shuffle algorithm.

Let's see an example

let array = [1, 2, 3, 4, 5];

for (let i = array.length - 1; i >= 1; i--) {

    let j = Math.floor(Math.random() * (i + 1));

    let temp = array[j];
    array[j] = array[i];
    array[i] = temp;
}

console.log(array);

Output

[ 3, 5, 2, 4, 1 ]

Thank you for reading

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