Browse the latest JavaScript performance benchmarks created by the community.
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Performance comparison of Map.get() !== undefined to check if element exists and Map.has() as most of the time you need the element after the .has() check anyway. LIMITATION: The checks are not completely the same. If the map contains a key whose value is intentionally set to undefined (Map.set(1, undefined)), .has() will return true, while the .get() !== undefined will be false.
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Compares performance of using for-in vs Object.keys for checking emptiness of an object.
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Compare the basic performance of different ways of checking whether a given item is an instance of a specific class.
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