From: "ara.t.howard" <ara.t.howard@...>
Date: 2007-06-06T06:45:16+09:00
Subject: Re: [ANN] prototype-2.0.0


On Jun 5, 2007, at 2:19 PM, James Edward Gray II wrote:

> On Jun 5, 2007, at 3:03 PM, ara.t.howard wrote:
>
>>
>> On Jun 5, 2007, at 12:55 PM, Victor Zverok Shepelev wrote:
>>
>>> * Does anybody uses it in real projects? I mean, does prototype- 
>>> based
>>> approach in not prototype-based language have proved to be  
>>> useful? The
>>> question is not about "throw the library away", but about "who  
>>> can say, what
>>> features in library are useful", "who can recommend library for  
>>> some tasks?"
>>
>> example
>>
>>   Config = Object.prototype{
>>     YAML.load(IO.read('config')).each do |key, value|
>>       attribute key => value
>>     end
>>   }
>>
>>   p Config.host
>>   p Config.port
>
> Which is significantly better than:
>
> require "ostruct"
> Config = OpenStruct.new(
>   File.open("config") { |file| YAML.load(file) }
> )
>
> ?

yes, i think so:

cfp:~ > cat a.rb
require 'rubygems'
require 'prototype'
require 'ostruct'
require 'yaml'

hash = {
:id => 42,
:send => 'ara.t.howard@gmail.com',
:class => 'first',
}

running 'prototype' do
   config = prototype.configured hash
   p config.id
   p config.send
   p config.class
end

running 'ostruct' do
   config = OpenStruct.new hash
   p config.id
   p config.send
   p config.class
end


BEGIN {
   def running name
     puts "<======== #{ name } ========"
     begin
       yield
     rescue => e
       m, c, b = e.message, e.class, e.backtrace.join("\n")
       puts "#{ m }(#{ c })\n#{ b }"
     ensure
       puts
     end
   end
}


cfp:~ > ruby a.rb
<======== prototype ========
42
"ara.t.howard@gmail.com"
"first"

<======== ostruct ========
a.rb:21: warning: Object#id will be deprecated; use Object#object_id
125270
no method name given(ArgumentError)
a.rb:22:in `send'
a.rb:22
a.rb:31:in `running'
a.rb:19


realize too that using a prototype for a Config class is but a tiny  
tiny sample of where it might benefit someone.  anywhere you have a  
singleton or a copy constructor it's worth considering.

i'll have some magnetic code posted soon - you can look at that for  
an example of grittier prototype use.

kind regards.

-a
--
we can deny everything, except that we have the possibility of being  
better. simply reflect on that.
h.h. the 14th dalai lama