From: Trans <transfire@...>
Date: 2007-06-15T23:44:31+09:00
Subject: Using extend for initialization settings?

It's not uncommon to see initialize method take a hash or a setting
proc and apply that to accessors. Eg.

  def initialize( settings )
    settings.each{|k,v| send("{#k}=",v)
  end

or

  def initialize( &settings )
    settings.call(self)
  end

Today I come up with another potential approach:

  class Hash
    def to_module(module_function=false)
      m = Module.new
      each do |k,v|
        m.send(:define_method, k){ v }
        m.send(:module_function, k) if module_function
      end
      return m
    end
  end

  M = { :a => 1 }.to_module(true)
  p M.a  #=> 1


  class Foo
    def initialize( settings )
      extend settings.to_module
    end
  end

  f = Foo.new(:x => 9)
  p f.x  #=> 9


Thoughts?

T.