[Rails] Array and Hash ... how to find the value ? DRYest way

I have an array of hash :
tags_on
=> [{:point=>["a", "b", "c"]}, {:comma=>["d", "e"]}]

and I would like to get the value ["d", "e"] for a specified
key :comma
is there any DRY way to do it or should I loop into the array ?

thanks for your feedback

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