From: David Naseby <david.naseby@...>
Date: 2003-12-15T11:43:59+09:00
Subject: Re: How to convert hashed parameters to local variables?

>-----Original Message-----
>From: Dennis Misener [mailto:dm@accesscable.net]
>
>What I desire is an implementation for "parameters" such that:
>
>def announce(args)
>	parameters(args,:age=>21)
>	"My name is #{first} #{last} and my age is #{age}"
>end
>
>announce(:first=>'John', :last=>'Smith') generates
>"My name is John Smith and my age is 21"
>
Closest I can get is :

require 'ostruct'

def announce args
  parameterise( args, :age=>21 ) do |template|
    "My name is #{template.first} #{template.last} and my age is
#{template.age}"
  end
end

def parameterise args, defaults, &block
  args = defaults.update args
  template = OpenStruct.new( args )
  block.call( template )
end

puts announce( {:first=>'John', :last=>'Smith'} )

David
http://homepages.ihug.com.au/~naseby/