As of 3/31/2023, I intend to submit a pull request to turn the
change-array-by-copy feature on by default. It has been developed behind
the javascript.options.experimental.enable_change_array_by_copy
preference. It is shipping unflagged in Safari/JavaScriptCore and Chrome/v8.
The change-array-by-copy JavaScript feature introduces four new methods
on Arrays and TypedArrays that do non-destructive transformations on
arrays (returning a copy of the array). Code examples can be found at
https://github.com/tc39/proposal-change-array-by-copy . The proposal is
complete and has been merged into the ECMAScript spec (
https://github.com/tc39/ecma262/pull/2997 )
The tracking bug for shipping this feature unflagged to Nightly is
https://bugzilla.mozilla.org/show_bug.cgi?id=1811057
I don't think a previous "intent to prototype" email was sent. As far as
I know, this feature doesn't require any special DevTools support; I'm
also not aware of any security or privacy concerns. Tests for each of
the four new methods (toReversed, toSorted, toSpliced, and with) are
included in test262. (
https://github.com/tc39/test262/tree/main/test/built-ins/Array/prototype
and
https://github.com/tc39/test262/tree/main/test/built-ins/TypedArray/prototype
).
Thanks,
Tim
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