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// Copyright (C) 2018 Valerie Young. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-asyncgenerator-prototype-next
description: next() requests from iterator processed in order, then
info: >
AsyncGenerator.prototype.next ( value )
1. Let generator be the this value.
2. Let completion be NormalCompletion(value).
3. Return ! AsyncGeneratorEnqueue(generator, completion).
AsyncGeneratorEnqueue ( generator, completion )
...
4. Let queue be generator.[[AsyncGeneratorQueue]].
5. Let request be AsyncGeneratorRequest{[[Completion]]: completion,
[[Capability]]: promiseCapability}.
6. Append request to the end of queue.
...
AsyncGeneratorResolve ( generator, value, done )
...
2. Let queue be generator.[[AsyncGeneratorQueue]].
3. Assert: queue is not an empty List.
4. Remove the first element from queue and let next be the value of that element.
...
flags: [async]
features: [async-iteration]
---*/
var yieldorder = 0;
var resolveLatePromise;
function resolveLater() {
return new Promise(resolve => {
resolveLatePromise = resolve;
});
}
async function* g() {
yield resolveLater();
yield ++yieldorder;
}
var iter = g();
var item1 = iter.next();
var item2 = iter.next();
var item3 = iter.next();
var resolvedorder = 0;
Promise.all([
item3.then(function(result) {
resolvedorder++;
assert.sameValue(resolvedorder, 3);
assert.sameValue(result.value, undefined);
assert.sameValue(result.done, true);
}),
item2.then(function(result) {
resolvedorder++;
assert.sameValue(resolvedorder, 2);
assert.sameValue(result.value, 2);
assert.sameValue(result.done, false);
}),
item1.then(function(result) {
resolvedorder++;
assert.sameValue(resolvedorder, 1);
assert.sameValue(result.value, 1);
assert.sameValue(result.done, false);
})
]).then(function() { $DONE(); }, $DONE);
// At this point:
// yieldorder == 0
// item1 is an unresolved promise
resolveLatePromise(++yieldorder);
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