From: Brian Candler <B.Candler@...>
Date: 2004-10-12T21:42:24+09:00
Subject: Auto-created Array elements?

a = Array.new { [] }
p a     #=> []
p a[3]  #=> nil

Just checking: you can't have an Array whose elements spring into life when
needed (as you can with a Hash)?

Maybe a good thing - you might not want a single access to a[10000] to
create that many objects - but it could be useful on occasions.

No need to post other solutions - I can subclass/delegate such that [], []=
are overridden appropriately, although usually I just end up writing

    a[x] ||= []
    a[x][y] = 'whatever'

Regards,

Brian.