Array.prototype.findLast(callback) returns the last element that passes your test. It searches from the end toward the start. No match → undefined. Does not mutate the array (ES2023).
array.findLast((element, index, array) => test)
scans from the end → first hit from the tail
no match → undefined
find() → first match from the start
findLastIndex() → index of last match (−1 if none)Call array.findLast. Start with this line.
array.findLast(callback, thisArg?)| Call | What it does |
|---|---|
array.findLast(callback, thisArg?) | Primary signature. |
array.findLast(...) | Call with the arguments your case needs. |
Built into JavaScript. Call findLast(...) on an array instance — no import required.
array.findLast(callback, thisArg?)| Parameter | Description |
|---|---|
| callback | Required. Test function; truthy → return that element |
| index, array | Optional. Extra callback args when needed |
| Return Value | Description |
|---|---|
| * | Last match, or undefined |
Return the last value greater than 30—scanning from the end.
const numbers = [10, 20, 30, 40, 50];
const result = numbers.findLast((n) => n > 30);
console.log(result); // 504 is checked first.50 > 30 is true.50—no need to look at 40.> 30 would be 40.find() vs findLast()Same predicate, two directions—two different high scores.
const scores = [85, 90, 75, 90, 60];
const firstHigh = scores.find((s) => s >= 90);
const lastHigh = scores.findLast((s) => s >= 90);
console.log("find:", firstHigh); // 90 (index 1)
console.log("findLast:", lastHigh); // 90 (index 3)1 and 3 are both 90.1 first.3 first (in reverse).Find the most recent active user when the list is ordered oldest → newest.
const users = [
{ name: "Alice", status: "active" },
{ name: "Bob", status: "inactive" },
{ name: "Charlie", status: "active" }
];
const lastActive = users.findLast((u) => u.status === "active");
console.log(lastActive);Array.prototype.findLast() is part of ES2023. Evergreen browsers shipped it in 2022; Node.js added it in version 18.
Supported in Chrome 97+, Firefox 104+, Safari 15.4+, Edge 97+, and Node 18+. Not available in Internet Explorer or older Node releases.
Bottom line: Safe for current evergreen browsers and Node 18+. For older targets, polyfill or loop from length - 1 downward.
Get the position of the last match—or -1 when nothing passes.
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