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creationix/run.js

Last active March 7, 2017 18:36
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universal callback/continuable/thunk generator runner
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run.js
function run(generator) {
// Pass in resume for no-wrap function calls
var iterator = generator(resume);
var data = null, yielded = false;
next();
check();
function next(item) {
var cont = iterator.next(item).value;
// Pass in resume to continuables if one was yielded.
if (typeof cont === "function") cont(resume());
yielded = true;
}
function resume() {
var done = false;
return function () {
if (done) return;
done = true;
data = arguments;
check();
};
}
function check() {
while (data && yielded) {
var err = data[0];
var item = data[1];
data = null;
yielded = false;
if (err) return iterator.throw(err);
next(item);
yielded = true;
}
}
}
@craftgear
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craftgear commented Aug 8, 2013

Hi, creationix.
May I ask you a question?

In the following code, you pass an argument to iterator.next() method.

10    var cont = iterator.next(item).value;

But whenever I pass any value to iterator.next(), there's nothing to happen.

var x = function()* {
    yield true;
}
var y = x();
y.next('foo'); //return true

What's the meaning of passing an argument to iterator.next() ?

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