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: