Jan 20, 2025 · Here are the different methods to reverse an array in JavaScript. 1. Using the reverse() Method. JavaScript provides a built-in array method called reverse() that reverses the elements of the array in place. This method mutates the original array and returns the reversed array. JavaScript

Apr 16, 2012 · Pure functions to reverse an array using functional programming: var a = [3,5,7,8]; // ES2015 function immutableReverse(arr) { return [ ...a ].reverse(); } // ES5 function immutableReverse(arr) { return a.concat().reverse() }

function temporarySwap(array) { var left = null; var right = null; var length = array.length; for (left = 0, right = length - 1; left < right; left += 1, right -= 1) { var temporary = array[left]; array[left] = array[right]; array[right] = temporary; } return array; }

The reverse() method reverses the order of the elements in an array. The reverse() method overwrites the original array.

Aug 22, 2023 · Array.prototype.reverse reverses the contents of an array in place (with mutation)... Is there a similarly simple strategy for reversing an array without altering the contents of the original array (without mutation)? You can use slice () to make a copy then reverse () it.

Dec 15, 2023 · Using the reverse() MethodJavaScript provides a built-in array method called reverse() that reverses the elements of the array in place. This method mutates the original array and returns the reversed array.

Jan 18, 2021 · Reversing an array with certain restrictions is one of the most common challenges you will find in job interviews and coding quizzes. This tutorial will show you five ways to reverse an array in JavaScript with and without the reverse …

Apr 3, 2025 · The reverse() method of Array instances reverses an array in place and returns the reference to the same array, the first array element now becoming the last, and the last array element becoming the first.

Aug 27, 2024 · There are a few main approaches to reversing arrays in JavaScript: 1. Array.prototype.reverse() Built-in method ; Mutates original array in place; Simple syntax, fast performance; 2. Manual loop algorithm. Iterate backwards pushing to new array; Does not mutate original ; More explicit logic; 3. Immutable variants

Using reverse() by itself will mutate, or modify, the original array. Using slice() with no arguments will default to slice(0), which returns the array from element 0 to the end of the array. In other words, slice() returns a copy of the array while reverse() mutates the copied array.