JavaScript performance difference between double equals (==) and triple equals (===)

Strict comparison (===) will always be slightly faster, but the difference is usually negligible.

It definitely makes sense to prefer === if you know for certain that you don't need type coercion in the comparison. It will always be at least as fast as ==.

• If the types compared are the same, they are identical. That is to say they use the exact same algorithm.

• If the types are different, then performance is irrelevant. Either you need type coercion, or you don't. If you don't need it, don't use == because the result you get may be unexpected.