By $_-using functions, I mean functions that take their argument from the implicit variable $_, instead of relying on "actual" arguments that a sub receives in @_

Some second-order functions (e.g. map, as I learned in map sub to list?) prefer $_-using functions, instead of functions that use their @_ arguments:

Is one style preferred over the other in general? How can I convert between them?

sub f1 ($) { shift(@_) + 1 }
sub f2 { $_ + 1 }
map (f1($), (10, 20))  # convert f1 to $_-style
my $x = f1 (10)        # call f1 with an arg
# my $y = f2 (10)      # won't work, how to use f2??

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P.S. How do I even search for stuff like this? I'm sure others must have asked this before.

In reply to $_ functions vs argument-using functions by pldanutz

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