This chunk of code:
# change normal array separator my $foo = $"; $" = "\n"; print FH "@head"; $" = $foo; # change back
could be replaced with:
{ local $" = "\n"; print FH "@head"; }
Using local removes the need for a temporary variable, as the saving and restoring of the previous value of the global $" variable is taken care of for you.

See local, the "Temporary values via local()" and "When to still use local()" sections of perlman:perlsub, and for a more detailed explanation and examples, see brother Dominus's Seven Useful Uses of local.

-sacked

In reply to (sacked: improvement- use local) Re: mail::sendmail with an array of hashes by sacked
in thread mail::sendmail with an array of hashes by dystrophy

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