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- 'use strict';
- var $ = require('../internals/export');
- var call = require('../internals/function-call');
- var aCallable = require('../internals/a-callable');
- var anObject = require('../internals/an-object');
- var getIteratorDirect = require('../internals/get-iterator-direct');
- var createIteratorProxy = require('../internals/iterator-create-proxy');
- var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');
- var IS_PURE = require('../internals/is-pure');
- var IteratorProxy = createIteratorProxy(function () {
- var iterator = this.iterator;
- var predicate = this.predicate;
- var next = this.next;
- var result, done, value;
- while (true) {
- result = anObject(call(next, iterator));
- done = this.done = !!result.done;
- if (done) return;
- value = result.value;
- if (callWithSafeIterationClosing(iterator, predicate, [value, this.counter++], true)) return value;
- }
- });
- // `Iterator.prototype.filter` method
- // https://github.com/tc39/proposal-iterator-helpers
- $({ target: 'Iterator', proto: true, real: true, forced: IS_PURE }, {
- filter: function filter(predicate) {
- anObject(this);
- aCallable(predicate);
- return new IteratorProxy(getIteratorDirect(this), {
- predicate: predicate
- });
- }
- });
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