self と self.class の違い
self.classは自身のクラスを返す。selfは自身のクラスまたはインスタンスを返す。
class Hoge def moge puts self.class.methods end def noge puts self.methods end end h = Hoge.new h.moge puts "-----" h.noge
出力結果は下記となる。
new allocate superclass <=> module_exec class_exec <= >= == === include? included_modules ancestors name public_instance_methods instance_methods private_instance_methods protected_instance_methods const_get constants const_defined? const_set class_variables class_variable_get remove_class_variable class_variable_defined? class_variable_set private_constant public_constant singleton_class? deprecate_constant freeze inspect module_eval const_missing prepend method_defined? class_eval public_method_defined? private_method_defined? < public_class_method > protected_method_defined? private_class_method to_s autoload autoload? instance_method public_instance_method include instance_of? public_send instance_variable_get instance_variable_set instance_variable_defined? remove_instance_variable private_methods kind_of? instance_variables tap public_method singleton_method is_a? extend define_singleton_method method to_enum enum_for =~ !~ eql? respond_to? display object_id send nil? hash class singleton_class clone dup itself taint tainted? untaint untrust trust untrusted? methods protected_methods frozen? public_methods singleton_methods ! != __send__ equal? instance_eval instance_exec __id__ ----- moge noge instance_of? public_send instance_variable_get instance_variable_set instance_variable_defined? remove_instance_variable private_methods kind_of? instance_variables tap public_method singleton_method is_a? extend define_singleton_method method to_enum enum_for <=> === =~ !~ eql? respond_to? freeze inspect display object_id send to_s nil? hash class singleton_class clone dup itself taint tainted? untaint untrust trust untrusted? methods protected_methods frozen? public_methods singleton_methods ! == != __send__ equal? instance_eval instance_exec __id__
