| 1 | 'use strict';
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| 2 |
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| 3 | var $ = require('../internals/export');
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| 4 | var aFunction = require('../internals/a-function');
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| 5 | var anObject = require('../internals/an-object');
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| 6 | var createIteratorProxy = require('../internals/iterator-create-proxy');
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| 7 | var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');
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| 8 |
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| 9 | var IteratorProxy = createIteratorProxy(function (arg) {
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| 10 | var iterator = this.iterator;
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| 11 | var result = anObject(this.next.call(iterator, arg));
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| 12 | var done = this.done = !!result.done;
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| 13 | if (!done) return callWithSafeIterationClosing(iterator, this.mapper, result.value);
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| 14 | });
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| 15 |
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| 16 | $({ target: 'Iterator', proto: true, real: true }, {
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| 17 | map: function map(mapper) {
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| 18 | return new IteratorProxy({
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| 19 | iterator: anObject(this),
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| 20 | mapper: aFunction(mapper)
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| 21 | });
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| 22 | }
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| 23 | });
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