37 lines
1.3 KiB
JavaScript
37 lines
1.3 KiB
JavaScript
'use strict';
|
|
var getPrototypeOf = require('../internals/object-get-prototype-of');
|
|
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
|
|
var has = require('../internals/has');
|
|
var wellKnownSymbol = require('../internals/well-known-symbol');
|
|
var IS_PURE = require('../internals/is-pure');
|
|
|
|
var ITERATOR = wellKnownSymbol('iterator');
|
|
var BUGGY_SAFARI_ITERATORS = false;
|
|
|
|
var returnThis = function () { return this; };
|
|
|
|
// `%IteratorPrototype%` object
|
|
// https://tc39.github.io/ecma262/#sec-%iteratorprototype%-object
|
|
var IteratorPrototype, PrototypeOfArrayIteratorPrototype, arrayIterator;
|
|
|
|
if ([].keys) {
|
|
arrayIterator = [].keys();
|
|
// Safari 8 has buggy iterators w/o `next`
|
|
if (!('next' in arrayIterator)) BUGGY_SAFARI_ITERATORS = true;
|
|
else {
|
|
PrototypeOfArrayIteratorPrototype = getPrototypeOf(getPrototypeOf(arrayIterator));
|
|
if (PrototypeOfArrayIteratorPrototype !== Object.prototype) IteratorPrototype = PrototypeOfArrayIteratorPrototype;
|
|
}
|
|
}
|
|
|
|
if (IteratorPrototype == undefined) IteratorPrototype = {};
|
|
|
|
// 25.1.2.1.1 %IteratorPrototype%[@@iterator]()
|
|
if (!IS_PURE && !has(IteratorPrototype, ITERATOR)) {
|
|
createNonEnumerableProperty(IteratorPrototype, ITERATOR, returnThis);
|
|
}
|
|
|
|
module.exports = {
|
|
IteratorPrototype: IteratorPrototype,
|
|
BUGGY_SAFARI_ITERATORS: BUGGY_SAFARI_ITERATORS
|
|
};
|