From: Stefan Rusterholz <apeiros@...>
Date: 2007-08-19T06:57:50+09:00
Subject: Re: wishing of reactive programming in ruby

ashishwave wrote:
> ruby integrates power of functional programming from lisp , purest OO
> from smalltalk, prototype oriented power from self etc etc into one
> single language
> 
> i just was wondering that whether the heavy developers/users of
> reactive languages like kanaputs or reactive-C etc will ever get
> reactive features in ruby.
> 
> in kanaputs, If the variable 'c' is defined as  c = a + b; and if the
> reactivity of 'c' is set (c.reactive = true;), then each time the
> value of 'a' or 'b' changes then the value of 'c' is updated as the
> result of the addition
> 
> 
> bye :-)
> Ashish
> ashishwave@yahoo.com.

Not the same, probably rather slow, but hey:

class Expression < BlankSlate
  def initialize(&expression)
    @expression = expression
  end

  def method_missing(*a, &b)
    @expression.call.send(*a, &b)
  end
end

a = 1
b = 2
c = Expression.new { a + b }
c + 3 # => 6
a = 5
c + 3 # => 10

Have fun ;-)

Regards
Stefan
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