[Webkit-unassigned] [Bug 131698] Simple ES6 feature: Array.from

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=131698

--- Comment #6 from Caitlin Potter <caitpotter88 at gmail.com> ---
You're correct, for-of and the spread operator are supported for certain types (although strings appear to not be iterable yet in JSC).

However, iterator methods seem to be attached via private properties / internal slots, rather than using the well-known symbol @@iterator.

The Array.from algorithm uses `GetMethod(items, @@iterator)` to determine whether or not it can use the from-iterable path or the from-array-like path, so an implementation is still sort of blocked on that (or at least blocked on exposing a getter for the private iterator properties to JS builtins, if it is to be implemented in JS).

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