Prototype-1.0.0

ara.t.howard · May 25, 2007, 6:26am

NAME

prototype.rb

INSTALL

gem install prototype

URIS

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

SYNOPSIS

prototype.rb facilitates a prototype based coding style

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

for ruby

WHY

prototype based programming looks very nice

also, there are many problems that a genuine singleton object with
cloning
abilities can illuminate clearly

HISTORY

1.0.0

 cleanup up a small error where bareword syntax errors in a

prototype block
were silently ignored

SAMPLES

<========< samples/a.rb >========>

~ > 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

<========< samples/b.rb >========>

~ > cat samples/b.rb

 require 'prototype'

 DB = Prototype.new{
   host 'localhost'
   port 4242

   conn_string [host, port].join(':')

   def connect() p [host, port] end
 }

 p DB
 p DB.host
 p DB.port
 p DB.conn_string

 DB.connect

~ > ruby samples/b.rb

 #<#<Class:0x10f8948>:0x10f7fac @port=4242, @host="localhost",

@conn_string=“localhost:4242”>
“localhost”
4242
“localhost:4242”
[“localhost”, 4242]

<========< samples/c.rb >========>

~ > cat samples/c.rb

 require 'prototype'

 a = Prototype.new{
   def method() 42 end
 }

 b = a.clone

 p a.method
 p b.method

 a.extend{
   def method2() '42' end
 }

 p a.method2
 p b.method2

 b.extend{
   def method3() 42.0 end
 }

 p b.method3
 p a.method3  # throws error!

~ > ruby samples/c.rb

 42
 42
 "42"
 "42"
 42.0
 samples/c.rb:24: undefined method `method3' for #<#<Class:

0x10fb79c>:0x10fb42c> (NoMethodError)

<========< samples/d.rb >========>

~ > cat samples/d.rb

 require 'prototype'

 proto = prototype{ attributes 'a' => 1, 'b' => 2, 'c' => 3 }
 proto = prototype{ a 1; b 2; c 3 }

 %w( a b c ).each{|attr| p proto.send(attr)}

 clone = proto.clone
 proto.c = 42

 %w( a b c ).each{|attr| p proto.send(attr)}
 %w( a b c ).each{|attr| p clone.send(attr)}

~ > ruby samples/d.rb

<========< samples/e.rb >========>

~ > cat samples/e.rb

 require 'prototype'

 proto = Object.prototype{
   @a = 40
   @b = 2
 }

 p(proto.a + proto.b)

~ > ruby samples/e.rb

<========< samples/f.rb >========>

~ > cat samples/f.rb

 require 'prototype'

 a = Object.prototype{ attributes 'a' => 4, 'b' => 10, 'c' => 2}

 b = Object.prototype{ a 4; b 10; c 2 }

 c = Object.prototype{ @a = 4; @b = 10; @c = 2 }

 [a, b, c].each{|obj| p(obj.a * obj.b + obj.c) }

~ > ruby samples/f.rb

 42
 42
 42

<========< samples/g.rb >========>

~ > cat samples/g.rb

 require 'prototype'

 a = prototype

 b = prototype(a){ @a, @b, @c = 4, 10, 2 }

 a.extend{ def answer() a * b + c end }

 p b.answer

~ > ruby samples/g.rb

<========< samples/h.rb >========>

~ > cat samples/h.rb

 require 'prototype'

 proto = prototype{
   a 1
   b 1
   c 40

   sum { a + b + c }
 }

 p proto.sum

~ > ruby samples/h.rb

<========< samples/i.rb >========>

~ > cat samples/i.rb

 require 'prototype'

 o = Object.new

 o.prototyping do
   @a = 42
   attr 'a'
 end
 p o.a

 o = prototype do
   @a = 42
   attr 'a'
 end
 p o.a

 o.prototyping do
   @b = 42
   attr 'b'
 end
 p o.b
 o.prototyping do
   @b = 42.0
 end
 p o.b

~ > ruby samples/i.rb

enjoy.

-a