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Contents
# TITLE:
#
# NullClass
#
# SUMMARY:
#
# NullClass is essentially NilClass but it differs in one
# important way. When a method is called against it that it
# deoesn't have, it will simply return null value rather then
# raise an error.
#
# COPYRIGHT:
#
# Copyright (c) 2005 Thomas Sawyer
#
# LICENSE:
#
# Ruby License
#
# This module is free software. You may use, modify, and/or redistribute this
# software under the same terms as Ruby.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.
#
# AUTHORS:
#
# - Thomas Sawyer
# = NullClass
#
# NullClass is essentially NilClass but it differs in one
# important way. When a method is called against it that it
# deoesn't have, it will simply return null value rather then
# raise an error.
class NullClass #< NilClass
class << self
def new
@null ||= NullClass.allocate
end
end
def inspect ; 'null' ; end
def nil? ; true ; end
def null? ; true ; end
def [](key); nil; end
def method_missing(sym, *args)
return nil if sym.to_s[-1,1] == '?'
self
end
end
module Kernel
def null
NullClass.new
end
end
class Object
def null?
false
end
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
# TODO
=begin #testing
=end
Version data entries
13 entries across 13 versions & 1 rubygems