From: Adam Akhtar <adamtemporary@...>
Date: 2008-03-25T12:45:20+09:00
Subject: hash of arrays - appending to one of the arrays

Hi Ive done a search on this and there have been quite a few posts which
have incresed my knowlege somewhat but still have a few questions.

Im creating a hash of arrays. The keys and values are added within a
loop. For each key there may be multiple values hence the need for an
array as a value. Values for a key are found over interations of a loop.
I therefore have to append a new found value to the existing values in
an array.

I tried doing this

something.each do |blah|
if (test something)
    hash[key] = hash[key] + value
end
end

but the compliler complains about there being no method for nil class.

I read the basic way to do this would be

hash[key] = [] #create blank array
hash[key] = hash[key] + value

but as im in a loop that would require me to do a check to see if the
key exists  or not. If im processing lots of informatino that would slow
me down a bit.

IS there a slicker way of doing this?
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