Prototype-0.0.0

Ruby
1

NAME

prototype.rb

URIS

http://codeforpeople.com/lib/ruby/
http://rubyforge.org/projects/codeforpeople/

SYNOPSIS

prototype.rb implements the prototype design pattern

 http://en.wikipedia.org/wiki/Prototype-based_programming

for ruby

WHY

prototype based programming can look very nice :wink:

EXAMPLES

~ > cat samples/a.rb
require ‘prototype’

singleton = Prototype.new{
@a, @b = 40, 2

 def answer() @a + @b end

}

p singleton.answer

~ > ruby samples/a.rb
42

~ > cat samples/b.rb
require ‘prototype’

DB = Prototype.new{
host ‘localhost’
port 4242

 def connect() p [host, port] end

}

p DB.host
p DB.port
DB.connect

~ > ruby samples/b.rb
“localhost”
4242
[“localhost”, 4242]

DOCS

see

 lib/*rb
 samples/*rb

comments and patches welcome!

enjoy!

-a

2

[email protected] schrieb:

NAME

prototype.rb

(…)

comments and patches welcome!

Great idea, and a nice syntax, Ara. Here’s another implementation that
isn’t as
efficient, but more “dynamic” than yours:

module Prototype

 def self.new parent = nil, &blk
   mod = Module.new do

     include parent if parent
     extend self

     def clone
       Prototype.new self
     end

     def method_missing name, *args
       ivar = "@#{name}"
       case args.size
       when 0
         obj = ancestors.find { |m| m.instance_variables.include?

ivar }
if obj
obj.instance_variable_get ivar
else
super
end
when 1
instance_variable_set ivar, args.first
else
super
end
end

     def do &blk
       module_eval( &blk ) if blk
     end

   end
   mod.do( &blk )
   mod
 end

end

It allows things like:

Obj = Prototype.new {
v 42
def show; p v end
}
Obj.show # => 42

Cld = Obj.clone
Cld.show # => 42

Cld.v 45
Cld.show # => 45
Obj.show # => 42

Obj.do {
x “x”
def m; p x; end
}
Obj.m # => “x”
Cld.m # => “x”

Regards,
Pit

3

On Thu, 13 Jul 2006, Pit C. wrote:

Great idea, and a nice syntax, Ara. Here’s another implementation that isn’t
as efficient, but more “dynamic” than yours:

<snip - hey no fair stealing my 0.1.0 release!>

wait a few minutes and i’ll have what i was doing finished - it’s
basically
the same thing…

cheers.

-a

4

[email protected] schrieb:

<snip - hey no fair stealing my 0.1.0 release!>

So sorry :wink:

wait a few minutes and i’ll have what i was doing finished - it’s basically
the same thing…

Well, it has to wait until tomorrow, I’m going to bed now. Good to know
there’ll
be something interesting to read for breakfast…

Regards,
Pit