You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
29 lines
919 B
29 lines
919 B
3 years ago
|
'use strict';
|
||
|
|
// https://github.com/tc39/proposal-iterator-helpers
|
||
|
|
var $ = require('../internals/export');
|
||
|
|
var apply = require('../internals/function-apply');
|
||
|
|
var anObject = require('../internals/an-object');
|
||
|
|
var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
|
||
|
|
|
||
|
|
var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise, args) {
|
||
|
|
var state = this;
|
||
|
|
var iterator = state.iterator;
|
||
|
|
|
||
|
|
return Promise.resolve(anObject(apply(state.next, iterator, args))).then(function (step) {
|
||
|
|
if (anObject(step).done) {
|
||
|
|
state.done = true;
|
||
|
|
return { done: true, value: undefined };
|
||
|
|
}
|
||
|
|
return { done: false, value: [state.index++, step.value] };
|
||
|
|
});
|
||
|
|
});
|
||
|
|
|
||
|
|
$({ target: 'AsyncIterator', proto: true, real: true, forced: true }, {
|
||
|
|
asIndexedPairs: function asIndexedPairs() {
|
||
|
|
return new AsyncIteratorProxy({
|
||
|
|
iterator: anObject(this),
|
||
|
|
index: 0
|
||
|
|
});
|
||
|
|
}
|
||
|
|
});
|