From: Sam Smoot <ssmoot@...>
Date: 2007-01-17T05:20:13+09:00
Subject: Re: Can anyone try to solve this problems?

Here's my try at a Ruby 1.8 implementation of the Enumerable#max_by:

> a = %w{ one two three four }

> def a.max_by
>   pairs = inject({}) do |hash, obj|
>     hash[yield obj] = obj; hash
>   end
>   pairs[pairs.keys.max]
> end

> require 'facet/symbol/to_proc'
> a.max_by &:size
=> "three"