not_operator.rb

Use of the ! operator

# Some values, they are themselves

true      # => true
false     # => false
"value"   # => "value"
0         # => 0
nil       # => nil


!true     # => false
!false    # => true
!"value"  # => false
!0        # => false
!nil      # => true



!!true    # => true
!!false   # => false
!!"value" # => true
!!0       # => true
!!nil     # => false