Determine if a value exists in an array of hashes

Question

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

Magnar · Accepted Answer · 2009-10-03 21:18:29Z

125

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

answered Oct 3, 2009 at 21:18

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1 Comment

Nice and simple. Thanks!

DigitalRoss · Accepted Answer · 2013-05-14 22:55:06Z

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]