Re: Looping through a file, reading each line, and adding keys/editing values of a hash

You've already gotten the fix, but the important thing to note here is that you don't have to "start" a hash value with anything. You can just increment it, and it will be created and set to 1 if it didn't already exist. That saves you from having to do code like this, which might be necessary in lower-level languages:

if( $gene_count{$key} ){  # it already exists
  $gene_count{$key}++;    # so increment it
} else {                  # it doesn't exist
  $gene_count{$key} = 1;  # so create and set it
}
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Aaron B.
Available for small or large Perl jobs and *nix system administration; see my home node.

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Re^2: Looping through a file, reading each line, and adding keys/editing values of a hash by Anonymous Monk on Nov 10, 2015 at 06:13 UTC
Hi, If I want to store the count in the file itself as a key-value pair, how to do it? Thanks.	[reply]