A data structure as-described must
consist of a hash whose values are arrayrefs (or hashrefs). Therefore, first check to see if the key exists()
, then use e.g. grep()
to look for the desired value.
Be consistent: Arrange the program so that the hash always
contains an arrayref, even if it contains only one entry. Perl's "auto-vivification" features make the necessary code for building the structure short-and-sweet.
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