JavaScript (ES2026) reference · Array Methods

JavaScript Array unshift() Method

Add one or more elements to the start of the array and return the new length. Changes the array in place.

JavaScript (ES2026) Since ES3

Syntax

array.unshift(element1, /* …, */ elementN)

Parameter	Description
`elements`	Elements to add at the front.

The new length.

Add to the frontTry it yourself

const list = ["b", "c"];
console.log(list.unshift("a"), list);

Output

3 [ 'a', 'b', 'c' ]

Most recent firstTry it yourself

const recent = ["page2", "page1"];
recent.unshift("page3");
console.log(recent.slice(0, 2)); // the two most recent

Output

[ 'page3', 'page2' ]

Version	Change
JavaScript ES3	Added

array.shift() · Remove the first element of the array and return it, moving the other elements down. Returns undefined if empty.
array.push() · Add one or more elements to the end of the array and return the new length. Changes the array in place.
JavaScript Arrays · tutorial
JavaScript Array Methods · tutorial