JavaScript (ES2026) reference · Array Methods

JavaScript Array with() Method

Return a copy of the array with one element replaced, leaving the original unchanged. Negative indexes count from the end.

JavaScript (ES2026) Since ES2023

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Syntax

array.with(index, value)

Parameter	Description
`index`	Position to replace; negative counts from the end.
`value`	The new value.

A new array.

Replace one element in a copyTry it yourself

const days = ["Mon", "Tue", "Wed"];
console.log(days.with(1, "TUE"), days);

Output

[ 'Mon', 'TUE', 'Wed' ] [ 'Mon', 'Tue', 'Wed' ]

Negative indexTry it yourself

console.log([1, 2, 3].with(-1, 99));

Output

[ 1, 2, 99 ]

Version	Change
JavaScript ES2023	Added

array.at() · Return the element at an index, where negative indexes count from the end: arr.at(-1) is the last element.
array.toSpliced() · Return a new array with elements removed, replaced or inserted at a position, leaving the original unchanged.
array.splice() · Remove, replace or insert elements at a position, changing the array in place. Returns the removed elements.
JavaScript Arrays · tutorial
JavaScript Array Methods · tutorial