JavaScript (ES2026) reference · Array Methods

JavaScript Array findLastIndex() Method

Return the index of the last element that passes a test function, or -1 if none does.

JavaScript (ES2026) Since ES2023

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Syntax

array.findLastIndex(callbackFn, thisArg)

Parameter	Description
`callbackFn`	Called for each element with `(element, index, array)`.

An index, or -1.

Last match's indexTry it yourself

console.log([1, 8, 3, 9, 2].findLastIndex((n) => n > 5));

Output

No matchTry it yourself

console.log(["a", "b"].findLastIndex((x) => x === "z"));

Output

-1

Version	Change
JavaScript ES2023	Added

array.findIndex() · Return the index of the first element that passes a test function, or -1 if none does.
array.lastIndexOf() · Return the last index at which a value is found (using ===), searching backwards, or -1 if it isn't there.
array.findLast() · Return the last element that passes a test function, searching from the end, or undefined if none does.
JavaScript Arrays · tutorial
JavaScript Array Methods · tutorial