| 02:22 | <littledan> | So in the latest round of JS-is-missing-features discourse, one request that stands out is for Jack Works ‘s Number.range/BigInt.range. I am wondering, how can we move that forward? Is it blocked on anything? |
| 02:24 | <littledan> | I remember we had some kind of debate around how exactly arguments should work but everyone was positive about it IIRC |
| 03:00 | <bakkot> | I think the main blocker was whether the resulting thing should be one-shot or reusable |
| 03:00 | <bakkot> | and we just need to actually decide |
| 03:01 | <bakkot> | https://github.com/tc39/proposal-Number.range/issues/17, which is well on its way to being a centithread... |
| 03:02 | <ljharb> | indeed i think that's the open question. some iterators are reusable, so one might expect these to be; but most aren't, so one might expect these not to be |
| 03:03 | <bakkot> | iterators are never reusable, but many iterables are |
| 03:04 | <bakkot> | (iterators being inherently stateful) |
| 03:04 | <ljharb> | ah right, that's it |
| 03:21 | <bakkot> | from https://twitter.com/tesseralis/status/1622787957261488128, I am actually inspired to do Math.randomInt(), I think |
| 03:21 | <bakkot> | where, I guess, it is overloaded based on whether you pass numbers or bigints (and forbids both) |
| 03:22 | <bakkot> | or it could be called randomInRange or something |
| 03:22 | <bakkot> | though, if Number.range() gave you a re-usable thing, it could be a class instance with a .selectRandom() member... |
| 03:23 | <bakkot> | (that is mostly a joke, not a design I would seriously pursue) |
| 03:23 | <bakkot> | let getRandomItem = array => array[Number.range(array.length).selectRandom()] |
| 03:53 | <bakkot> | ok hear me out: for await.concurrent[2] (item of asyncIter) { ... } to run the body of the for-await concurrently. equivalent to await asyncIter.map(item => {...}).bufferAhead(2).forEach(() => {}) except that the body of the for-await can still do stuff like break and return (which prevent further iterations of the loop from starting, though any which have already started still run to the end of the loop body) |
| 03:58 | <littledan> | https://github.com/tc39/proposal-Number.range/issues/17, which is well on its way to being a centithread... |
| 03:58 | <littledan> | You should be able to use an iterator helper directly on a range |