From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2009-09-06T01:34:20+09:00
Subject: Re: something.new( :attribute => value) thing

On Sat, Sep 5, 2009 at 1:29 PM, Marc-antoine
Kruzik<kadelfek@kadelfek.com> wrote:
> Hello, I saw something very interesting in the code of FXRuby, and I
> would like to use this kind of code in my scripts :
>
> My_Window.new(app, "Button Test", :opts => DECOR_ALL, :x => 100, :y =>
> 100)

> What is the easiest way to create class which use the ":opts => ... x =>
> ... y => " part ?
> I'm sorry, I don't know the name of this feature, so it's quite
> difficult to find informations about it.

As Tim said, Ruby collects key-value pairs at the end of the argument
list as a Hash. Here's an example:

irb(main):007:0> def test(a,b,c)
irb(main):008:1> p [a,b,c]
irb(main):009:1> p c.class
irb(main):010:1> c.each {|key,value| p [key,value]}
irb(main):011:1> end
=> nil
irb(main):012:0> test(1,2,:xxx => 5, :y => 55)
[1, 2, {:xxx=>5, :y=>55}]
Hash
[:xxx, 5]
[:y, 55]

Jesus.