A Place for my head

If you have any hopes of becoming a Ruby guru, then regular dose of ruby-talk is a must. In this post, I would try to summarize some of the cool stuffs being discussed on ruby-talk.

• In Ruby, having method names that contain “-” can be PITA. So David Black and others were quick to point following approach of doing so:

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  irb(main):002:0> class C irb(main):003:1> define_method("x-y") { puts "Weird method" } irb(main):004:1> end # At which point, the only way to call it is: irb(main):005:0> C.new.send("x-y") # Weird method

  In other words, it’s not worth the trouble and you should find some
  other solution.

• Trans asked on ruby-talk, how can we know, which files are loading or requiring this file. Ara pointed following solution:

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  p Kernel.requiree('main')   require 'b'   p Kernel.requiree('main')   BEGIN { module Kernel h = Hash.new define_method(:requiree) do |of| h[of] end   r = method :require define_method(:require) do |*a| r.call *a h[a.first] = caller end end }

  The interesting bit around, should be noted.

  1	r = method :require

  When you call method and pass method name as a parameter, it returns a closure. Although as pointed by someone it breaks “Rubygems”, and above approach shouldn’t be used. Rather, one should use:

  1	alias_method :old_require, :require