Intent to prototype and ship: Iterator Includes

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Daniel Minor

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Jun 16, 2026, 12:23:43 PM (18 hours ago) Jun 16

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As of Firefox 154, I intend to turn Iterator.prototype.includes on by default. It has been developed behind the javascript.options.experimental.iterator_includes preference.

Summary:

Adds an Iterator.prototype.includes method that allows asking if an iterator will yield a specified value, similar to Array.prototype.includes.

Bug to turn on by default:
https://bugzilla.mozilla.org/show_bug.cgi?id=2034104

Specification:
https://github.com/tc39/proposal-iterator-includes

Standards Body:
TC39

Platform Coverage:
All

Preference:

javascript.options.experimental.iterator_includes

DevTools Bug:
N/A

Extensions Bug:
N/A

Use Counter:
N/A

Standards-Positions Discussion:
N/A

Other Browsers:

Blink, in progress, tracked by https://issues.chromium.org/issues/504886973
Safari, not started, tracked by https://bugs.webkit.org/show_bug.cgi?id=310698

web-platform-tests:
Covered by Test262, the tests haven't merged yet (https://github.com/tc39/test262/pull/5031), but I've landed a local version in tree.

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