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tc39 / proposal-flatMap

proposal for flatten and flatMap on arrays
https://tc39.github.io/proposal-flatMap
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Implementation status #71

Open chicoxyzzy opened 6 years ago

chicoxyzzy commented 6 years ago
keithamus commented 6 years ago

ChakraCore issue https://github.com/Microsoft/ChakraCore/issues/5543

chicoxyzzy commented 6 years ago

ChakraCore PR https://github.com/Microsoft/ChakraCore/pull/5573

chicoxyzzy commented 6 years ago

@bterlson @michaelficarra all major browsers has implemented these features. test262 already have tests (flat, flatMap). It seems that proposal needs just PR to ecma262 to become ES2019

ljharb commented 6 years ago

It’d also need committee consensus.

chicoxyzzy commented 6 years ago

It could be too late for consensus when most of browsers will start to ship it on by default.

While next TC39 meeting will happen on September 25

ljharb commented 6 years ago

I’m not sure what you mean by “too late”; stage 4 requires 1-2 shipping implementations minimum (at which point it’s web incompatible to unship it), but there’s no maximum.

chicoxyzzy commented 6 years ago

Oh. I though that by consensus you mean something like approvement from committee. That unshipping compatibility rule makes sense to me.

ljharb commented 6 years ago

Yes, the committee needs to officially approve stage 4 as well.

chicoxyzzy commented 6 years ago

So if feature won't be approved in the time when it will be shipped in most browsers then it won't go to spec. Though browsers can't unship this feature. Probably other environments will also ship that unspecced feature to make it possible to port code which works on those browsers to their platform. It seems like a big problem. Not sure I understand you correctly though

ljharb commented 6 years ago

I think you do; that something can’t be removed isn’t the same thing as that thing being in the spec, because that requires consensus. It’s all in the process document.

tschneidereit commented 6 years ago

This is correct in principle, as the TC39 process requires explicit committee approval for stage advancement. In practice, this is a rubber stamp and an opportunity to do a round of applause in a committee meeting :)

michaelficarra commented 6 years ago

Championing a proposal is (most of the time) a whole lot of work, and that round of applause means a lot. Looking forward to finally putting a bow on this one.