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Editing: esnext.iterator.map.js
'use strict'; // https://github.com/tc39/proposal-iterator-helpers 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 IteratorProxy = createIteratorProxy(function () { var iterator = this.iterator; var result = anObject(call(this.next, iterator)); var done = this.done = !!result.done; if (!done) return callWithSafeIterationClosing(iterator, this.mapper, [result.value, this.counter++], true); }); $({ target: 'Iterator', proto: true, real: true, forced: true }, { map: function map(mapper) { return new IteratorProxy(getIteratorDirect(this), { mapper: aCallable(mapper) }); } });
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