obj.nil? vs. obj == nil

Question

Is it better to use obj.nil? or obj == nil and what are the benefits of both?

Answer 1

You can use Symbol#to_proc on nil?, whereas it wouldn't be practical on x == nil.

arr = [1, 2, 3]
arr.any?(&:nil?) # Can be done
arr.any?{|x| x == nil} # More verbose, and I suspect is slower on Ruby 1.9.2
! arr.all? # Check if any values are nil or false