Danish Khan Danish Khan - 6 months ago 39
Ruby Question

obj.nil? vs. obj == nil

Is it better to use

obj.nil?
or
obj == nil
and what are the benefits of both?

Answer

Is it better to use obj.nil? or obj == nil

It is exactly the same. It has the exact same observable effects from the outside ( pfff ) *

and what are the benefits of both.

If you like micro optimizations all the objects will return false to the .nil? message except for the object nil itself, while the object using the == message will perform a tiny micro comparison with the other object to determine if it is the same object.

* See comments.

Comments