From: Jonathan Leighton <lists@...>
Date: 2006-01-09T09:03:50+09:00
Subject: Re: Passing a hash of args

On Mon, 2006-01-09 at 08:01 +0900, James Edward Gray II wrote:
> Well, Hashes are unordered by definition, but as long as we declare  
> an order it's doable:
> 
>  >> time = {
> ?>   :year => 2003,
> ?>   :month => 03,
> ?>   :day => 24
>  >> }
> => {:month=>3, :year=>2003, :day=>24}
>  >> Time.local(*time.values_at(:year, :month, :day))
> => Mon Mar 24 00:00:00 CST 2003

Cool. Thanks everyone. I didn't realise you could do *myvar when calling
a method as well as when defining them. I was basically looking for a
way to do the following (which I've managed to solve without use of a
hash):

class Time
  UNITS = [ :year, :month, :day, :hour, :min, :sec, :usec ]
  
  def to_precision(unit)
    args = []
    0.upto(UNITS.index(unit)) { |unit| args <<
method(UNITS[unit]).call }
    Time.local(*args)
  end
end

Is that a sensible way to do it?

Cheers

-- 
Jonathan Leighton
http://turnipspatch.com/ | http://jonathanleighton.com/ | http://digital-proof.org/