How to Reverse an Array in JavaScript

To reverse an array in JavaScript, use the reverse() function. reverse() will mutate the original array so be mindful of this fact when using this function.

const array = [1, 2, 3, 4, 5];
array.reverse();
array; // [5,4,3,2,1]

Immutable Approach

You can use the reverse() function in combination with the slice() function or spread operator ... to prevent mutating the original array.

const array = [1, 2, 3, 4, 5];
const newArray = array.slice().reverse();
array; // [1,2,3,4,5]
newArray; // [5,4,3,2,1]

or

const array = [1,2,3,4,5];
const newArray = [...array].reverse();
array; // [1,2,3,4,5]
newArray; // [5,4,3,2,1]

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