From: Jason Nordwick <jason@...>
Date: 2006-10-04T02:23:57+09:00
Subject: Re: sparse multi-dimensional arrays


irb(main):005:0> hsh[1]
=> {}
irb(main):006:0> hsh[2]
=> {}
irb(main):007:0> hsh[3]
=> {}
irb(main):008:0> hsh
=> {1=>{}, 2=>{}, 3=>{}}

ugh.

-j


Nathan Grant wrote:
>> $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/
>