From: "rosenfeld (Rodrigo Rosenfeld Rosas)" <rr.rosas@...>
Date: 2012-12-05T19:47:36+09:00
Subject: [ruby-core:50568] [ruby-trunk - Feature #6284] Add composition for procs


Issue #6284 has been updated by rosenfeld (Rodrigo Rosenfeld Rosas).


I play a 7-string guitar and I can tell you that the extra string greatly improves our possibilities and it is pretty common in Samba and Choro Brazilian music styles:

http://www.youtube.com/watch?v=3mTdpRY6yMI
http://www.youtube.com/watch?v=_FNDXcVr1Pk (here we not only have a 7-string guitar but also a 10-string bandolim while the usual one has 8 strings)

I'm not against #*. I just slightly prefer "<-" over "*".
----------------------------------------
Feature #6284: Add composition for procs
https://bugs.ruby-lang.org/issues/6284#change-34407

Author: pabloh (Pablo Herrero)
Status: Feedback
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: 
Target version: next minor


=begin
It would be nice to be able to compose procs like functions in functional programming languages:

    to_camel = :capitalize.to_proc
    add_header = ->val {"Title: " + val}

    format_as_title = add_header << to_camel << :strip

instead of:

    format_as_title = lambda {|val| "Title: " + val.strip.capitalize }


It's pretty easy to implement in pure ruby:

  class Proc
    def << block
      proc { |*args| self.call( block.to_proc.call(*args) ) }
    end
  end
=end


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