What does reverse mean in js

The function of the Array.prototype.reverse() method is to reverse the order of elements in the array and return the reversed original array. The usage is as follows: array.reverse().

The meaning of reverse() in JavaScript

In JavaScript, the Array.prototype.reverse() method The function is to reverse the order of elements in an array. It mutates the original array and returns the reversed array.

Usage

The syntax of the Array.prototype.reverse() method is very simple:

<code class="js">array.reverse();</code>

Among them:

• array is the array to be reversed.

Note: The reverse() method does not return a new array, but modifies and returns the original array.

Example

The following example shows the usage of reverse():

<code class="js">const arr = [1, 2, 3, 4, 5];
arr.reverse(); // [5, 4, 3, 2, 1]
console.log(arr); // 输出： [5, 4, 3, 2, 1]</code>

Application

reverse () method is useful in various situations, for example:

• Reverse a string.
• Reverse the array of numbers.
• Reverse the date array (from newest to oldest).
• Undo operations, such as undoing undo operations.

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