I was just about to create a new ticket about this. LiveScript needs the ability to easily iterate through iterators created by generator-functions/coroutines. From what I understand, the following syntax is currently used in ES6:

function *g() { yield 1; yield 2; yield 3; }
for (var i of g()) { console.log(i); }

So, I think for x from g! is a good idea.

It'd be wonderful being able to write something like:

[ x + 1 for x from g! ]

I would also like to strongly suggest additional syntax to compose generator functions using comprehensions. This is important if you have infinite lists or data streaming in. Consider the following:

numbers = ->*
    cnt = 0
    loop then yield ++cnt

even-numbers = *[ x for x from numbers! when x % 2 == 0 ] 

/*
where above creates a generator function similar to:
even-numbers = ->*
    for x from numbers!
        if x % 2 == 0 then yield x
*/

for x from even-numbers! then console.log x

I love writing things in terms of infinite lists, so I'm willing to do work to help put this in, if necessary.

ES6 Iterators #667

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