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Add `Array.prototype.findLast` and `Array.prototype.findLastIndex`

See original GitHub issue

lib Update Request

Configuration Check

My compilation target is ES5 and my lib is ESNext.

Missing / Incorrect Definition

Missing Array.prototype.findLast and Array.prototype.findLastIndex

Sample Code

[3, 2, 1].findLast(x => x > 2);

Documentation Link

Proposal: (currently stage 3 4) Can I Use: (Chrome and Safari already shipped it without flags)

Issue Analytics

  • State:open
  • Created a year ago
  • Reactions:25
  • Comments:11 (5 by maintainers)

github_iconTop GitHub Comments

DanielRosenwassercommented, Jun 6, 2022

@fatcerberus, the context is that @Kingwl is contributing the changeset to Firefox.

By the way, we reached Stage 4 today! 🎉🎉🎉

I believe that means we should add this to lib.es2023.array.d.ts.

monikamscommented, Oct 12, 2022

With which version of typescript I could use the method findLast?

Read more comments on GitHub >

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Array.prototype.findLastIndex() - JavaScript - MDN Web Docs
Array.prototype.findLastIndex(). The findLastIndex() method iterates the array in reverse order and returns the index of the first element ...
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Array and TypedArray findLast and findLastIndex
This is a Stage 3 TC39 proposal that adds the methods findLast and findLastIndex to Array.prototype and the various TypedArray.prototypes.
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array.prototype.findlastindex - npm
An ESnext spec-compliant `Array.prototype.findLastIndex` shim/polyfill/replacement that works as far down as ES3.. Latest version: 1.2.1, ...
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New in JavaScript: Array.findLast and Array.findLastIndex
Finding values in Arrays is a common practice via find and findIndex . These methods iterate from the array beginning, though. const things...
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227939 – Implement Array.prototype.findLast and Array ...
... Implement Array.prototype.findLast and Array.prototype.findLastIndex ... Show Obsolete (3) View All Add an attachment (proposed patch, testcase, etc.) ...
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