49 lines
1.6 KiB
JavaScript
Executable file
49 lines
1.6 KiB
JavaScript
Executable file
'use strict';
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// https://github.com/tc39/proposal-iterator-helpers
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var $ = require('../internals/export');
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var global = require('../internals/global');
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var anInstance = require('../internals/an-instance');
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var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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var fails = require('../internals/fails');
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var has = require('../internals/has');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;
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var IS_PURE = require('../internals/is-pure');
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var ITERATOR = wellKnownSymbol('iterator');
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var TO_STRING_TAG = wellKnownSymbol('toStringTag');
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var NativeIterator = global.Iterator;
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// FF56- have non-standard global helper `Iterator`
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var FORCED = IS_PURE
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|| typeof NativeIterator != 'function'
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|| NativeIterator.prototype !== IteratorPrototype
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// FF44- non-standard `Iterator` passes previous tests
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|| !fails(function () { NativeIterator({}); });
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var IteratorConstructor = function Iterator() {
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anInstance(this, IteratorConstructor);
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};
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if (IS_PURE) {
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IteratorPrototype = {};
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createNonEnumerableProperty(IteratorPrototype, ITERATOR, function () {
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return this;
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});
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}
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if (!has(IteratorPrototype, TO_STRING_TAG)) {
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createNonEnumerableProperty(IteratorPrototype, TO_STRING_TAG, 'Iterator');
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}
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if (FORCED || !has(IteratorPrototype, 'constructor') || IteratorPrototype.constructor === Object) {
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createNonEnumerableProperty(IteratorPrototype, 'constructor', IteratorConstructor);
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}
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IteratorConstructor.prototype = IteratorPrototype;
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$({ global: true, forced: FORCED }, {
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Iterator: IteratorConstructor
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});
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