method_defined?

method_defined?

■ ri

 ------------------------------------------------- Module#method_defined?
      mod.method_defined?(symbol)    => true or false
 ------------------------------------------------------------------------
      Returns  true  if the named method is defined by _mod_ (or its
      included modules and, if _mod_ is a class, its ancestors). Public
      and protected methods are matched.
 
         module A
           def method1()  end
         end
         class B
           def method2()  end
         end
         class C < B
           include A
           def method3()  end
         end
      
         A.method_defined? :method1    #=> true
         C.method_defined? "method1"   #=> true
         C.method_defined? "method2"   #=> true
         C.method_defined? "method3"   #=> true
         C.method_defined? "method4"   #=> false

■ refe

 Module#method_defined?
 --- method_defined?(name)
 
     モジュールにインスタンスメソッド name が定義されているとき真
     を返します。name は Symbol か文字列です。
 
     Module#public_method_defined? [Module/public_method_defined?],
     Module#private_method_defined? [Module/private_method_defined?],
     Module#protected_method_defined? [Module/protected_method_defined?]
     も参照してください。
「method_defined?」を含むキーワード