true, nil and false are the keywords in Ruby. In which
nil is a special keyword reserved to indicate the absence of value as name refer itself where
false are the two boolean values, and they represent truth and falsehood, yes and no, on and off.
Each of these keywords evaluates to a special object.
true evaluates to an object that is a singleton instance of
false evaluates to an object that is a singleton instances of
nil evaluates to an object that is a are singleton instances of
NilClass. Note that there is no
Boolean class in Ruby.
FalseClass both have
Object as their superclass.
If you want to check whether a value is
nil, you can simply compare it to
nil, or use the method
o == nil # Is o nil? o.nil? # Another way to test
nil refer to objects, not numbers.
nil are not the same thing as
true is not the same thing as
1. When Ruby requires a Boolean value,
nil behaves like
false, and any value other than
false behaves like