From: Florian Gross <flgr@...>
Date: 2005-01-22T00:45:57+09:00
Subject: Re: Refernce objects

Richard Turner wrote:

> Fair enough :)  I'd shy away from it because to me (at least, at the
> moment), it seems to imply enumeration.  I'd be tempted to assume that
> Section[] would 'fill' from index 0 so that, if there are any Sections,
> there will certainly be Section[0].  Since the parameter is an ID, not
> an index, it doesn't seem right.
> 
> On the other hand, Section{} sits fine in my head, since there's no
> implied order there :)

But we use the #[] method for both Hash, Array and Function access:

hash = { 1 => 2 }
hash[1]

ary = [1, 2]
ary[1]

fun = lambda { |x| x * 2 }
fun[2]

# mixture between lambda and hash. Nifty way for doing cached lambdas.
factorial = Hash.new do |hash, key|
   hash[key] = case
     when key == 1: 1
     when key < 1: 0
     else hash[key - 1] * key
   end
end
factorial[500]