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- // https://github.com/tc39/proposal-iterator-helpers
- var $ = require('../internals/export');
- var apply = require('../internals/function-apply');
- var anObject = require('../internals/an-object');
- var toObject = require('../internals/to-object');
- var isPrototypeOf = require('../internals/object-is-prototype-of');
- var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;
- var createIteratorProxy = require('../internals/iterator-create-proxy');
- var getIterator = require('../internals/get-iterator');
- var getIteratorMethod = require('../internals/get-iterator-method');
- var IteratorProxy = createIteratorProxy(function (args) {
- var result = anObject(apply(this.next, this.iterator, args));
- var done = this.done = !!result.done;
- if (!done) return result.value;
- }, true);
- $({ target: 'Iterator', stat: true, forced: true }, {
- from: function from(O) {
- var object = toObject(O);
- var usingIterator = getIteratorMethod(object);
- var iterator;
- if (usingIterator) {
- iterator = getIterator(object, usingIterator);
- if (isPrototypeOf(IteratorPrototype, iterator)) return iterator;
- } else {
- iterator = object;
- } return new IteratorProxy({ iterator: iterator });
- }
- });
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