All,
I was wondering if anyone knew a better patten than:
array_of_hashes.map { |hash_from_array| hash_from_array[:key] }
for retrieving an array of values with a specific key from an array of hashes containing that key.
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2looks fine to me, although the hash_from_array variable naming is a little bit of overkill. "h" would probably do it.klochner– klochner2010-02-10 17:33:16 +00:00Commented Feb 10, 2010 at 17:33
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heh, was mealy to improve the readability of the example. :)Roja Buck– Roja Buck2010-02-10 19:14:02 +00:00Commented Feb 10, 2010 at 19:14
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1a very direct solution - I like itJonathan Julian– Jonathan Julian2010-02-11 15:58:48 +00:00Commented Feb 11, 2010 at 15:58
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don't forget to compact the final array (result) :)vladr– vladr2010-02-27 07:33:38 +00:00Commented Feb 27, 2010 at 7:33
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1 Answer
From the Ruby code perspective, the map is pretty elegant and straightforward.
From the algorithmic point of view (to address the computer-science tag), it seems a solution to this problem cannot be better than going through the whole array once (i.e. a map here), so it will take as much time as to process each hash in the array.
@Vlad: Compacting the returned array depends on what will be done with the array, right? :-)
