From: Nathan Grant <futago@...>
Date: 2006-10-04T01:48:02+09:00
Subject: Re: sparse multi-dimensional arrays

> $a[0][0][0] = 0;
> $a[100][100][100] = 100;
> 
> print "$a[0][0][0]\n";
> print "$a[100][100][100]\n";
> 
> The output:
> 
> 0
> 100

I saw this on inquirylabs.com recently [1]

hsh = Hash.new(&(p=lambda{|h,k| h[k] = Hash.new(&p)}))

hsh[0][0][0] = 0             >> 0
hsh[100][100][100] = 100     >> 100

HTH

Nathan

[1] 
http://blog.inquirylabs.com/2006/09/20/ruby-hashes-of-arbitrary-depth/

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