64 lines
1.8 KiB
JavaScript
64 lines
1.8 KiB
JavaScript
// This test checks the shape of builtin iterators.
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function iteratorShape(iter) {
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if (iter.hasOwnProperty('next'))
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throw "Error: iterator should not have next method.";
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if (!iter.__proto__.hasOwnProperty('next'))
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throw "Error: iterator prototype should have next method.";
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if (typeof iter.__proto__.next !== "function")
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throw "Error: iterator prototype should have next method.";
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}
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function sameNextMethods(iterators) {
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var iterator = iterators[0];
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for (var i = 1; i < iterators.length; ++i) {
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if (iterator.next !== iterators[i].next)
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throw "Error: next method is not the same.";
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}
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}
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var array = ['Cocoa', 'Cappuccino', 'The des Alizes', 'Matcha', 'Kilimanjaro'];
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var iterator = array[Symbol.iterator]();
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iteratorShape(iterator);
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var keyIterator = array.keys();
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iteratorShape(keyIterator);
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var keyValueIterator = array.entries();
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iteratorShape(keyValueIterator);
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sameNextMethods([array[Symbol.iterator](), array.keys(), array.entries()]);
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var set = new Set(['Cocoa', 'Cappuccino', 'The des Alizes', 'Matcha', 'Kilimanjaro']);
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var iterator = set[Symbol.iterator]();
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iteratorShape(iterator);
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var keyIterator = set.keys();
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iteratorShape(keyIterator);
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var keyValueIterator = set.entries();
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iteratorShape(keyValueIterator);
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sameNextMethods([set[Symbol.iterator](), set.keys(), set.entries()]);
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var map = new Map();
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[
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[ 'Cocoa', 2, ],
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[ 'Cappuccino', 0 ],
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[ 'The des Alizes', 3 ],
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[ 'Matcha', 2 ],
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[ 'Kilimanjaro', 1]
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].forEach(function ([ key, value ]) {
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map.set(key, value);
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});
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var iterator = map[Symbol.iterator]();
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iteratorShape(iterator);
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var keyIterator = map.keys();
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iteratorShape(keyIterator);
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var keyValueIterator = map.entries();
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iteratorShape(keyValueIterator);
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sameNextMethods([map[Symbol.iterator](), map.keys(), map.entries()]);
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