From: Bill Kelly <billk@...>
Date: 2003-12-03T06:32:57+09:00
Subject: Re: Rite, Block locals and Autovivification

Hi,

From: "John Carter" <john.carter@tait.co.nz>
>
> def histogram( enum)
>   # <--- Implicit hash = Hash.new(0) here
>   enum.each{|e| hash[e]+=1} # Hash autovivifies.

eh?  But... somevar[e] ... Why would Ruby assume I wanted a Hash
object?  That could be an Array, or a String, or.......

Do you mean the autovivification would happen only if the variable
was actually _named_ 'hash' ?

Or am I not understanding your example?

>   # Since hash autovivified we expect it to be available
>   # outside the block scope.
>   hash.keys.sort{|a,b| hash[a]<=>hash[b]}.each do |k|
>     puts "#{k}\t#{hash[k]}"
>   end
> end


Regards,

Bill