From: Yossef Mendelssohn <ymendel@...>
Date: 2011-10-20T07:43:16+09:00
Subject: Re: Moving files into alphabetical directories

On Oct 19, 4:47 pm, Jesús Gabriel y Galán <jgabrielyga...@gmail.com>
wrote:
> A way to get a hash that contains a key for each letter with an array
> of words starting with that letter:
>
> h = {}
> names.each do |name|
>   letter = name[0,1].upcase #seems the letters must be upcased
>   (h[letter] ||= []) << name
> end

This is a good place to use Enumerable#group_by.

    >> names = %w(simon sadie tyler kirsty kevin keith)
    => ["simon", "sadie", "tyler", "kirsty", "kevin", "keith"]
    >> names.group_by { |n| n[0,1].upcase }
    => {"K"=>["kirsty", "kevin", "keith"], "S"=>["simon", "sadie"],
"T"=>["tyler"]}

--
-yossef