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文件: /usr/share/nodejs/core-js-pure/modules/esnext.iterator.from.js
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// https://github.com/tc39/proposal-iterator-helpers var $ = require('../internals/export'); var call = require('../internals/function-call'); var isPrototypeOf = require('../internals/object-is-prototype-of'); var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype; var createIteratorProxy = require('../internals/iterator-create-proxy'); var getIteratorFlattenable = require('../internals/get-iterator-flattenable'); var IteratorProxy = createIteratorProxy(function () { return call(this.next, this.iterator); }, true); $({ target: 'Iterator', stat: true, forced: true }, { from: function from(O) { var iteratorRecord = getIteratorFlattenable(O); return isPrototypeOf(IteratorPrototype, iteratorRecord.iterator) ? iteratorRecord.iterator : new IteratorProxy(iteratorRecord); } });
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