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Explainerhttps://github.com/tc39/proposal-array-find-from-last

Specificationhttps://tc39.es/proposal-array-find-from-last/index.html

Summary

This is a Stage 3 TC39 proposal that adds the methods findLast and
findLastIndex to Array.prototype and the various TypedArray.prototypes.
These methods are the "from the end" versions of find and findIndex.


Blink componentBlink>JavaScript>Language
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EJavaScript%3ELanguage>

TAG review

TAG review statusNot applicable

Risks


Interoperability and Compatibility

Adding any new methods to Array.prototype runs the risk of web
incompatibility due to breaking old libraries. Rollout will need to be
monitored.


Gecko: Positive This is Stage 3 in TC39

WebKit: Positive This is Stage 3 in TC39

Web developers: Positive (
https://twitter.com/mgechev/status/1432199126570131459?s=20)


Debuggability

It is a new prototype method, so can be debugged like any other prototype
method.


Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md>
?Yes, in test262

Flag name--harmony-array-find-last

Requires code in //chrome?False

Tracking bughttps://bugs.chromium.org/p/v8/issues/detail?id=11990

Estimated milestones
DevTrial on desktop 94
DevTrial on android 94
DevTrial on Webview 94

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5693639729610752

This intent message was generated by Chrome Platform Status
<https://www.chromestatus.com/>.

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