blob: 5cf33915b76cf03cd1ea4059ec49cd02c095ba97 [file] [log] [blame]
'use strict';
// https://github.com/tc39/proposal-iterator-helpers
var $ = require('../internals/export');
var anObject = require('../internals/an-object');
var toPositiveInteger = require('../internals/to-positive-integer');
var createIteratorProxy = require('../internals/create-iterator-proxy');
var IteratorProxy = createIteratorProxy(function (arg) {
var iterator = this.iterator;
var next = this.next;
var result, done;
while (this.remaining) {
this.remaining--;
result = anObject(next.call(iterator));
done = this.done = !!result.done;
if (done) return;
}
result = anObject(next.call(iterator, arg));
done = this.done = !!result.done;
if (!done) return result.value;
});
$({ target: 'Iterator', proto: true, real: true }, {
drop: function drop(limit) {
return new IteratorProxy({
iterator: anObject(this),
remaining: toPositiveInteger(limit)
});
}
});