From: Mike Stok <mike@...>
Date: 2011-02-07T21:20:55+09:00
Subject: Re: making hash key from arrays

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On Feb 7, 2011, at 7:12 AM, Arihan Sinha wrote:

> Thanks for this but I am getting like
> 
> [[300, 1], [300, 2], [301, 1], [301, 3], [301, 4], [302, 3], [302, 4]]
> 
> but I actually need like
> 
> hsh = {"300" =>["1","2"],"301" => ["1","3","4"],"302"=>["3","4"]}
> 
> any help

In ruby 1.9's irb:

 ratdog:~ mike$ irb
 >> keys = [300,300,301,301,301,302,302]
 => [300, 300, 301, 301, 301, 302, 302]
 >> values = [1, 2,  1,  3,  4,  3, 4]
 => [1, 2, 1, 3, 4, 3, 4]
 >> hsh = Hash.new{ |h, k| h[k] = [] }
 => {}
 >> keys.zip(values) { |k, v| hsh[k] << v }
 => nil
 >> hsh
 => {300=>[1, 2], 301=>[1, 3, 4], 302=>[3, 4]}

Mike

- -- 

Mike Stok <mike@stok.ca>
http://www.stok.ca/~mike/

The "`Stok' disclaimers" apply.




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