From: Travis Whitton <whitton@...>
Date: 2003-03-27T00:08:18+09:00
Subject: Re: How can one implement composition of functions in Ruby?

> One of the most important issues for me is the ability to write in a
> functional style of programing. So far I saw than python supports it
> more but may be I'm wrong?

Ruby does a fine job at functional programming. You can even do partial
evaluation(aka currying):

class Object
  def curry(symbol, *fixedArgs)
    lambda { |*args| method(symbol).call(*(fixedArgs + args)) }
  end
end

def sum(a, b)
  a + b
end
plus4 = curry(:sum, 4)
plus4.call(5) # => 9
arrayOfFive = Array.curry(:new, 5)
arrayOfFive.call("A") # => ["A", "A", "A", "A", "A"]

See the Wiki page: http://www.rubygarden.org/ruby?FunctionalRuby
for more examples.

-Travis