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intc39/proposal-array-from-async (press backspace or delete to remove)Previously, for await did not close sync iterables when they yield rejected promises (tc39/ecma262#1849):
details summary Code example /summary
function * createIter() {
try {
yield Promise.resolve(console.log( ...
js-choi
- 4
- Opened on Apr 1
- #49
Things are looking very healthy for when this is ready for Stage advancement:
Implementations
- [x] Chrome (121): https://chromestatus.com/feature/5069575759069184
- [x] Firefox (115): https://bugzilla.mozilla.org/show_bug.cgi?id=1795816 ...
tchetwin
- 5
- Opened on Mar 3
- #47
After #36 was merged, Array.fromAsync spec now depends on tc39/ecma262#2942, just like proposal-async-iterator-helpers.
@bakkot points out that the current spec uses AsyncFunctionStart directly rather ...
- 1
- Opened on Nov 1, 2023
- #43
I am interested in this proposal but would like clarification on the above. My use-case would be to filter a current
Array using an async mapFn to return a new Array with only the values that passed the ...
question
secondl1ght
- 4
- Opened on Aug 4, 2023
- #42
for await is known to not close sync iterables if rejected promise is emited. Like
function* It() {
try {
yield Promise.resolve( a )
yield Promise.reject( b )
} finally {
console.log( ...
documentation
vadzim
- 2
- Opened on Mar 2, 2023
- #39
As written, the spec -may- double counstruct A:
It will be constructed first as part of Step 3.{e,f}; then if iteratorRecord is undefined, it s constructed again in
Step 3.k.{iv,v}.
Probably that first ...
mgaudet
- 3
- Opened on Oct 18, 2022
- #35
Other recent proposals adding methods to Array.prototype have added the name to Array.prototype[@@unscopables] -- I sort
of imagine fromAsync should get added too.
- 2
- Opened on Oct 14, 2022
- #34
In the published spec, Step 3.j.ii.3 and 4 are the termination condition of the iteration:
- Step 3.j.ii.3 Let next be ? Await(IteratorStep(iteratorRecord)).
- Step 3.j.ii.4 If next is false, then... ...
bug
- 2
- Opened on Oct 14, 2022
- #33
fromAsync makes use of an Abstract Closure passed to AsyncFunctionStart. What is the return type of this closure? The
use of ? implies it must be a Completion Record, but there s also a bare Return A. ...
question
bakkot
- 2
- Opened on Aug 11, 2022
- #31
Right now, the proposed algorithm uses %Array.prototype.values%, CreateArrayIterator, and %ArrayIteratorPrototype%. This
is a shortcut for the machinery that handles non-iterable array-like objects, like ...
question
- 1
- Opened on Jul 20, 2022
- #29
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