LGTM1
/Daniel
On 2025-12-02 10:48, Chromestatus wrote:
*Contact emails*
[email protected]
*Specification*
https://github.com/tc39/proposal-upsert
*Summary*
ECMAScript proposal for Map.prototype.getOrInsert,
Map.prototype.getOrInsertComputed, WeakMap.prototype.getOrInsert, and
WeakMap.prototype.getOrInsertComputed.
*Blink component*
Blink>JavaScript>Language
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EJavaScript%3ELanguage%22>
*Web Feature ID*
getorinsert <https://webstatus.dev/features/getorinsert>
*Motivation*
/No information provided/
*Initial public proposal*
/No information provided/
*TAG review*
/No information provided/
*TAG review status*
Not applicable
*Risks*
*Interoperability and Compatibility*
/No information provided/
/Gecko/:
Shipped/Shipping (https://www.firefox.com/en-US/firefox/144.0/releasenotes) Firefox
now supports the upsert proposal. This adds getOrInsert and
getOrInsertComputed methods to Map and WeakMap. These methods either
return the value associated with a key, or insert a default value, and
then return that value, simplifying handling of cases where it's not
known if a key is already present in the Map or WeakMap.
/WebKit/:
Shipped/Shipping (https://developer.apple.com/documentation/safari-release-notes/safari-18_4-release-notes) Added
support for Map.prototype.getOrInsert and
WeakMap.prototype.getOrInsert. (138955824)
/Web developers/: No signals
/Other signals/:
*WebView application risks*
Does this intent deprecate or change behavior of existing APIs, such
that it has potentially high risk for Android WebView-based applications?
/No information provided/
*Debuggability*
/No information provided/
*Will this feature be supported on all six Blink platforms (Windows,
Mac, Linux, ChromeOS, Android, and Android WebView)?*
No
*Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
No
https://github.com/tc39/test262/pull/4454
*Flag name on about://flags*
--js-flags=--js_upsert
*Finch feature name*
V8Flag_js_upsert
*Rollout plan*
Will ship enabled for all users
*Requires code in //chrome?*
False
*Tracking bug*
https://issues.chromium.org/u/1/issues/434977728
*Estimated milestones*
Shipping on desktop 145
DevTrial on desktop 143
Shipping on Android 145
DevTrial on Android 143
*Anticipated spec changes*
Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github
issues in the project for the feature specification) whose resolution
may introduce web compat/interop risk (e.g., changing to naming or
structure of the API in a non-backward-compatible way).
/No information provided/
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/5201653661827072?gate=6583456041664512
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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