The values you read from QUERYFILE contain the end of line characters, while your $ID does not, so $ID is not an exact match. You can try chomp @queries;, or maybe process all the input keys to make sure they match the expected format (ex: remove extra spaces, or have everything in uppercase).

Although defined would work in this case (because the value is 1), exists is the standard way of checking the presence of a key in a hash.

In reply to Re: Hash searching by Eily
in thread Hash searching by Oligo

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