promote `yield* next` instead of `yield next`

[jonathanong]

it's faster: tj/co#43

at least it'll work with or without it. it's an easy win. testing koa's benchmark, here's loa without yield*:

with yield*:

only problem is that next() should always return a generator. that's an easy fix.

[jonathanong]

i think the best thing about yield* next is that now next is explicitly a generator.

[tj]

that's not even remotely enough of a gain to worry about IMO, add one console.log() per request and you take a bigger hit. If anything we could improve co's perf by adding a shared scheduler but not a huge deal really. I don't like the context switching between yield and delegation

[jonathanong]

i'm not worrying about it :P it's just free to me.

[tj]

it would kinda almost be nicer if javascript would just auto-delegate when you yield a generator, maybe make yield * the inverse haha.. meh

[jonathanong]

i wish there were no stars anywhere

[tj]

that too

[jrpereira]

"i wish there were no stars anywhere"

That really describes the sentiment. :)

[yf-hk]

+1
Is there any significant drawbacks when using yield* like memory consumption or cpu usage?
IMO it should be not too hard, and it also has less chance to break something. So hopefully it will be finally changed.

[jonathanong]

there really isn't any downside, but it's probably not worth the cognitive overhead for new beginners, especially with async/await coming along.