From: Markus <markus@...>
Date: 2004-09-24T00:13:31+09:00
Subject: Re: Newbie: Case statement

On Thu, 2004-09-23 at 05:04, Florian Gross wrote:

> Yup, you can use this as a case that checks all options:
> 
> def greedy_case(obj, cases)
>    cases.find_all do |condition, action|
>      condition === obj
>    end.inject(Hash.new) do |hash, (condition, action)|
>      hash[condition] = action.call; hash
>    end
> end
> 
> def test(x)
>    greedy_case(x,
>      1 .. 2 => lambda { puts "In A" },
>      1 .. 3 => lambda { puts "In B" },
>      2 .. 4 => lambda { puts "In C" })
> end
> 
> test(2)

Nice.  Thats the best examples of writing your own control structure
I've seen in a quite while.  *smile*  And it even has the
non-deterministic aspect that Dijkstra was so fond of.

-- Markus