Intent to prototype and ship: Iterator Join

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Daniel Minor

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Jun 16, 2026, 12:30:55 PM (18 hours ago) Jun 16

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

Summary:

This adds a new Iterator.prototype.join method that allows joining an iterator into a string, similar to Array.prototype.join.

Bug to turn on by default:
https://bugzilla.mozilla.org/show_bug.cgi?id=2047995

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

Standards Body:
TC39

Platform Coverage:
All

Preference:

javascript.options.experimental.iterator_join

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/465715798
Safari, not started, I was unable to find a tracking bug.

web-platform-tests:
Covered by Test262, the tests haven't merged yet (https://github.com/tc39/test262/pull/4768), but I've landed a local version in tree.

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