From: 7stud -- <bbxx789_05ss@...>
Date: 2011-05-28T05:30:24+09:00
Subject: Re: Hash .each and different action for each key

Leigh Daniels wrote in post #1001612:
>   if k == "a"
>     one(v)
>   end
>   if k == "b"
>     two(v)
>   end
>   if k == "c"
>     three(v)
>   end
> end

That is a horribly inefficient construct: three if tests must be 
exectued for every key--no matter what.  Compare that to:

if k == 'a'

elsif k == 'b'

elsif k == 'c'

else

A 'when statement' works similarly.

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