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