Intent to Ship: Joint Iteration

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Chromestatus

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Aug 5, 2026, 8:40:54 AM (8 days ago) Aug 5
to blin...@chromium.org, niko...@chromium.org, ol...@google.com
Contact emails
niko...@chromium.org, ol...@google.com

Specification
https://github.com/tc39/proposal-joint-iteration

Summary
A TC39 proposal to synchronise the advancement of multiple iterators, often called zip.

Blink component
Blink>JavaScript>Language

Web Feature ID
tc39-joint-iteration

Motivation
No information provided

Initial public proposal
No information provided

TAG review
No information provided

TAG review status
Not applicable

Goals for experimentation
None

Risks


Interoperability and Compatibility
No information provided

Gecko: Shipped/Shipping (https://bugzilla.mozilla.org/show_bug.cgi?id=2003333)

WebKit: In development (https://bugs.webkit.org/show_bug.cgi?id=303246)

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?
No


Flag name on about://flags
No information provided

Finch feature name
V8Flag_js_joint_iteration

Rollout plan
Will ship enabled for all users

Requires code in //chrome?
False

Tracking bug
https://issues.chromium.org/issues/465357675

Estimated milestones
Shipping on desktop153
Shipping on Android153
Shipping on WebView153


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/6249068542164992?gate=6511364124311552

This intent message was generated by Chrome Platform Status.

Daniel Bratell

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Aug 5, 2026, 10:39:31 AM (8 days ago) Aug 5
to Chromestatus, blin...@chromium.org, niko...@chromium.org, ol...@google.com

LGTM1

Stage 4 TC39 proposal already implemented elsewhere. Thanks for getting it into Chromium.

/Daniel

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Vladimir Levin

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Aug 5, 2026, 11:08:41 AM (8 days ago) Aug 5
to blink-dev, Daniel Bratell, niko...@chromium.org, ol...@google.com, Chromestatus
LGTM2

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Chris Harrelson

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Aug 5, 2026, 11:09:52 AM (8 days ago) Aug 5
to Vladimir Levin, blink-dev, Daniel Bratell, niko...@chromium.org, ol...@google.com, Chromestatus
LGTM3

LGTM2

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