From: Edmond Kachale <edmond.kachale@...>
Date: 2011-02-02T23:56:52+09:00
Subject: Soliciting some help with inject method

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Rubysters,

I think I am not wrong if I can solicit some knowledge. :-)

Can any one help modify this code?

I have:
array = [['a', 1], ['b', 2], ['a',2], ['c',4], ['d', 5], ['b',4]]

I want to create a hash using inject method:
>> hash = {'a' => [1, 2], 'b' => [2, 4], 'c' => [4], 'd' => [5]}

The following code gives: {"a"=>[2], "b"=>[4], "c"=>[4], "d"=>[5]}

hash  = array.inject({}) do |result, array|
new_hash = {}
new_hash[array.first] = [array.last]
result.merge!(new_hash)  # I have tried result.update(new_hash) but it fails
too
result
end

Here is a console friendly version of the same:
hash  = array.inject({}){|result, array| new_hash = {};
new_hash[array.first] = [array.last]; result.merge!(new_hash); result;}

Thanks in advance,

---
Edmond
Software Developer | Baobab Health Trust (http://www.baobabhealth.org/) |
Malawi

Cell:  +265 999 465 137 | +265 881 234 717

*I wish you a Merry Christmas and a Prosperous New Year 2011!!**
*

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