What's the reason to use === instead of == with typeof in Javascript?

Question

Throughout many third-party libraries and best practices blogs/recommendations, etc... it is common to see syntax like this:

typeof x === \'object\' (instead         


        

Answer 1

If the typeof operator already returns a string, what's the need to type check the return value as well? If typeof(typeof(x)) is always string, no matter what x actually is, then == should be sufficient and === unnecessary.

It's subjective. You can just as easily turn this around, and ask, "Why would you use == when you don't expect implicit conversions?" Both work fine here, so use the one you feel expresses your intention better. Try to be consistent within a project.