From: Suraj Kurapati <snk@...>
Date: 2009-03-31T08:18:47+09:00
Subject: Re: Is there an idiom for mass-populating Hash keys?

Suraj Kurapati wrote:
> consider this "dynamic programming" based Fibonacci sequence implementation:
> 
>   fib = Hash.new {|h,k| k < 2 ? 1 : h[k-1] + h[k-2] }

Whoops, I forgot to store the computed value in the hash!

  fib = Hash.new {|h,k| h[k] = k < 2 ? 1 : h[k-1] + h[k-2] }

Now it should work.  Sigh :-)
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