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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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