Question

While it’s clear how using the === operator for e.g. numbers is useful (0, null and undefined all being falsy values, which can lead to confusion), I’m not sure if there are benefits to using === for string comparisons.

Some of my team mates use this operator for all comparisons, but does it really make sense? Is there at least some minor performance impact?

Answer 1

If you know the types are the same, then there’s no difference in the algorithm between == and ===.

That said, when I see ==, I assume that I’m using it for its type coercion, which makes me stop and analyze the code.

When I see === I know that there’s no coercion intended, so I don’t need to give it a second thought.

In other words, I only use == if I intend for there to be some sort of type coercion.