Determine if a value exists in an array of hashes

Asked 2009-10-03T21:15:24.990

I have the following:

array_of_hashes = [{:a=>10, :b=>20}, {:a=>11, :b=>21}, {:a=>13, :b=>23}]

How would I go about finding if :a=>11 exists in array_of_hashes

array_of_hashes.include? does not seem to work

ruby arrays

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1 Answer

You did ask for a boolean result in the OQ, but if you really want the hash element itself do:

array_of_hashes.detect {  |h| h[:a] == 11 }

If you want the result really fast you could group the original object and then get the result with a single hash lookup:

t = array_of_hashes.group_by { |x| x[:a] }
t[11]

answered 2009-10-03T21:28:55.907