Feature #6594

Updated by nobu (Nobuyoshi Nakada) over 6 years ago

 I know the developers meeting is coming up so I'd like to get a few ideas I've had sitting in the wings out in the air before then. 

 One the more useful is the idea of integrating Functors directly into the language. "Functor" is the term I use for "higher-order function". 

 I blogged about this idea and you can read it here: 

 The super short version is this: 


   def f => op, arg 
     arg.send(__op__, arg) 


   f + 3    #=> 6 
   f * 3    #=> 9 

 Another example: 


   class String 
     def file => op, *args 
       File.send(__op__, self, *args) 


   "README.rdoc".file.mtime    #=> 2012-06-14 12:34:45 -0400 

 I'm using `=>` as means of indicating a higher-order function. Of course another syntax could be used if this won't fly. The important thing is the idea of higher-order functions being integrated directly into the language. Doing this without that integration requires the creation of an intermediate object for each call which is very inefficient.