2 # An object is blank if it's false, empty, or a whitespace string.
3 # For example, "", " ", +nil+, [], and {} are blank.
7 # if !address.nil? && !address.empty?
13 respond_to
?(:empty?) ? empty
? : !self
16 # An object is present if it's not blank.
22 class NilClass
#:nodoc:
28 class FalseClass
#:nodoc:
34 class TrueClass
#:nodoc:
41 alias_method
:blank?, :empty?
45 alias_method
:blank?, :empty?
54 class Numeric
#:nodoc: