class Object
# An object is blank if it's false, empty, or a whitespace string.
# For example, "", " ", +nil+, [], and {} are blank.
#
# This simplifies
#
# if !address.nil? && !address.empty?
#
# to
#
# if !address.blank?
def blank?
respond_to?(:empty?) ? empty? : !self
end
# Similar to Numeric#nonzero? -- returns itself if not blank (per +blank?+),
# otherwise returns false. Simplifies e.g.
#
# name = params[:name].blank? ? "Default name" : params[:name]
#
# to
#
# name = params[:name].nonblank? || "Default name"
def nonblank?
!blank? && self
end
end
class NilClass #:nodoc:
def blank?
true
end
end
class FalseClass #:nodoc:
def blank?
true
end
end
class TrueClass #:nodoc:
def blank?
false
end
end
class Array #:nodoc:
alias_method :blank?, :empty?
end
class Hash #:nodoc:
alias_method :blank?, :empty?
end
class String #:nodoc:
def blank?
self !~ /\S/
end
end
class Numeric #:nodoc:
def blank?
false
end
end
