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esnext.iterator.drop.js
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esnext.iterator.drop.js
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'use strict';
var $ = require('../internals/export');
var call = require('../internals/function-call');
var anObject = require('../internals/an-object');
var getIteratorDirect = require('../internals/get-iterator-direct');
var notANaN = require('../internals/not-a-nan');
var toPositiveInteger = require('../internals/to-positive-integer');
var createIteratorProxy = require('../internals/iterator-create-proxy');
var IS_PURE = require('../internals/is-pure');
var IteratorProxy = createIteratorProxy(function () {
var iterator = this.iterator;
var next = this.next;
var result, done;
while (this.remaining) {
this.remaining--;
result = anObject(call(next, iterator));
done = this.done = !!result.done;
if (done) return;
}
result = anObject(call(next, iterator));
done = this.done = !!result.done;
if (!done) return result.value;
});
// `Iterator.prototype.drop` method
// https://github.com/tc39/proposal-iterator-helpers
$({ target: 'Iterator', proto: true, real: true, forced: IS_PURE }, {
drop: function drop(limit) {
anObject(this);
var remaining = toPositiveInteger(notANaN(+limit));
return new IteratorProxy(getIteratorDirect(this), {
remaining: remaining
});
}
});