%GID = map { $temp[0] => $temp[1] } @temp;

This assigns two elements to %GID, throwing away all other items in that hash that might been in there before. Not what you want. Instead, just write $GID{$temp[0]} = $temp[1].

There's also no reason to build the @list1 and @list2 arrays. Finally you can get rid of %GID completely by first iterating over <FH2> and building %CVDgenes, and then iterate over <FH1> directly.

Perl 6 - links to (nearly) everything that is Perl 6.

In reply to Re: hash lookup by moritz
in thread hash lookup by dr_joe

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