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- 'use strict';
- // https://github.com/tc39/proposal-iterator-helpers
- var $ = require('../internals/export');
- var apply = require('../internals/function-apply');
- var aCallable = require('../internals/a-callable');
- var anObject = require('../internals/an-object');
- var createIteratorProxy = require('../internals/iterator-create-proxy');
- var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');
- var IteratorProxy = createIteratorProxy(function (args) {
- var iterator = this.iterator;
- var result = anObject(apply(this.next, iterator, args));
- var done = this.done = !!result.done;
- if (!done) return callWithSafeIterationClosing(iterator, this.mapper, result.value);
- });
- $({ target: 'Iterator', proto: true, real: true, forced: true }, {
- map: function map(mapper) {
- return new IteratorProxy({
- iterator: anObject(this),
- mapper: aCallable(mapper)
- });
- }
- });
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