From: Brian Candler <b.candler@...>
Date: 2009-06-03T23:57:48+09:00
Subject: Re: block as string

# Slightly enhanced version
module Kernel
  alias :orig_lambda :lambda
  def lambda(src=nil,*rest,&blk)
    if src.nil?
      orig_lambda(&blk)
    else
      res = eval "lambda { #{src} }", *rest
      class << res; self; end.class_eval { define_method(:source) { src 
} }
      res
    end
  end
end

a = lambda { |x| puts x+x }
b = lambda %{ |x| puts x+x+x }
a["a"]
b["b"]
puts b.source

# %{...} performs substitutions as per double-quoted string
prefix = "hello"
c = lambda %{ |x| puts "#{prefix} " + x }
puts c.source
c["world"]

# %q{...} is like single-quoted string
d = lambda %q{ |x| puts "#{prefix} " + x }, binding
puts d.source
d["world"]
prefix = "goodbye"
d["world"]
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