From: Daniel Finnie <danfinnie@...>
Date: 2006-12-10T08:51:37+09:00
Subject: Re: Help me with some nested Hashes.

Thanks, that works perfectly!  (I'm only storing 1 char strings)

Joel VanderWerf wrote:
> Joel VanderWerf wrote:
>> Daniel Finnie wrote:
>>> What I want to do is have 2 nested hashes, the outer hash returning a 
>>> new hash on an unknown key and the inner hash returning a space on an 
>>> unknown key.
>>
>> value = Hash.new {|h,k| h[k] = Hash.new {|h1,k1| h1[k1] = " "}}
>>
>> p value[5][6]       # ==> " "
>> value[5][6] = "H"
>> p value             # ==> {5=>{6=>"H"}}
>>
> 
> Another option, in case you don't want all those empty strings 
> cluttering up your hash:
> 
> value = Hash.new {|h,k| h[k] = Hash.new {" "}}
> 
> p value[5][6]       # ==> " "
> p value             # ==> {5=>{}}
> 
> value[5][6] = "H"
> p value             # ==> {5=>{6=>"H"}}
> 
> # But, with this variation, beware:
> 
> value[5][7] << "add some characters after the space"
> p value[5][7]       # ==> " "
>