Array.prototype.reverse()

Overview.

The Array.prototype.reverse() method reverses the order of the elements in an array in place. The first array element becomes the last, and the last array element becomes the first.

Syntax

array.reverse();

Parameters

return value

The modified array with its elements reversed.

Examples

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

Use Cases

Displaying a list in reverse order

The reverse() method is useful when you want to display a list in reverse order. For example, if you have a list of messages and you want to display them in reverse chronological order (i.e., newest first), you can use the reverse() method to reverse the order of the list.

const messages = ["Message 1", "Message 2", "Message 3", "Message 4"];
const reversedMessages = messages.reverse();
console.log(reversedMessages); // ["Message 4", "Message 3", "Message 2", "Message 1"]

Reversing a string

You can use the reverse() method to reverse a string by converting it to an array, reversing the order of the elements, and then converting it back to a string.

const str = "hello";
const reversedStr = str.split("").reverse().join("");
console.log(reversedStr); // "olleh"

Notes

The reverse() method modifies the original array and returns the reversed array.