Actually, you need to remember only those few functions that put information in $_ (like map, grep, foreach, commandline -n etc); not those lots of functions that _optionally_ default on $_ (like print, split, m//, sin, unlink) because for these you can just always use these with an explicit argument.

In reply to Re^3: a rule of thumb for $_ in Perl by ambrus
in thread a rule of thumb for $_ in Perl by apotheon

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