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# = 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.
#
# TODO: Perhaps NullClass should be called NackClass?
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
# Copyright (c) 2005 Thomas Sawyer
Version data entries
10 entries across 9 versions & 2 rubygems