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
969 B
29 lines
969 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 toPositiveInteger = require('../internals/to-positive-integer');
|
||
|
|
var createIteratorProxy = require('../internals/iterator-create-proxy');
|
||
|
|
var iteratorClose = require('../internals/iterator-close');
|
||
|
|
|
||
|
|
var IteratorProxy = createIteratorProxy(function (args) {
|
||
|
|
var iterator = this.iterator;
|
||
|
|
if (!this.remaining--) {
|
||
|
|
this.done = true;
|
||
|
|
return iteratorClose(iterator, 'normal', undefined);
|
||
|
|
}
|
||
|
|
var result = anObject(apply(this.next, iterator, args));
|
||
|
|
var done = this.done = !!result.done;
|
||
|
|
if (!done) return result.value;
|
||
|
|
});
|
||
|
|
|
||
|
|
$({ target: 'Iterator', proto: true, real: true, forced: true }, {
|
||
|
|
take: function take(limit) {
|
||
|
|
return new IteratorProxy({
|
||
|
|
iterator: anObject(this),
|
||
|
|
remaining: toPositiveInteger(limit)
|
||
|
|
});
|
||
|
|
}
|
||
|
|
});
|