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[6a3a178] | 1 | // https://github.com/tc39/proposal-iterator-helpers
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| 2 | var $ = require('../internals/export');
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| 3 | var path = require('../internals/path');
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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 toObject = require('../internals/to-object');
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| 7 | var createIteratorProxy = require('../internals/iterator-create-proxy');
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| 8 | var getIteratorMethod = require('../internals/get-iterator-method');
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| 9 |
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| 10 | var Iterator = path.Iterator;
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| 11 |
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| 12 | var IteratorProxy = createIteratorProxy(function (arg) {
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| 13 | var result = anObject(this.next.call(this.iterator, arg));
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| 14 | var done = this.done = !!result.done;
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| 15 | if (!done) return result.value;
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| 16 | }, true);
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| 17 |
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| 18 | $({ target: 'Iterator', stat: true }, {
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| 19 | from: function from(O) {
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| 20 | var object = toObject(O);
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| 21 | var usingIterator = getIteratorMethod(object);
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| 22 | var iterator;
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| 23 | if (usingIterator != null) {
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| 24 | iterator = aFunction(usingIterator).call(object);
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| 25 | if (iterator instanceof Iterator) return iterator;
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| 26 | } else {
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| 27 | iterator = object;
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| 28 | } return new IteratorProxy({
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| 29 | iterator: iterator
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| 30 | });
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| 31 | }
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| 32 | });
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