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Re: shift vs @_

by Anonymous Monk
on Oct 03, 2006 at 08:27 UTC ( #576013=note: print w/replies, xml ) Need Help??

in reply to shift vs @_

Suppose you'd write a function like map, its first argument plays a very different role than the rest - which can be any length. Wouldn't it make sense to write:
sub my_map { my $special_thingy = shift; foreach my $item (@_) { apply($special_thingy, $item); } }
Starting with
my ($special_thingy, @list_of_items) = @_;
is a potentially costly operation, since you are copying everything else in @_ - and it is slightly different as you lose the aliasing. And writing:
sub my_map { foreach my $item (@_[1 ..$#_]) { apply($_[0], $item); } }
sub my_map { for (my $i = 1; $i < @_; $i++) { apply($_[0], $_[$i]); } }
is not something I fancy.

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