my $left=$_[0];
my $right=$_[1];

[download]

which is the same as

my $left = shift @_;
my $right = shift @_;

[download]

It is not the same at all. The first version doesn't modify @_. The second one does modify it. The difference is often very important. (For example, if you're planning on using goto.)

use Test::More;
use Data::Dumper;

sub func1 {
    my $left=$_[0];
    my $right=$_[1];
    goto \&Data::Dumper::Dumper;
}

sub func2 {
    my $left = shift @_;
    my $right = shift @_;
    goto \&Data::Dumper::Dumper;
}

my @args = qw( a b );

# Are they the same??
is(
    func1(@args),
    func2(@args),
    "they're the same!",
);

done_testing();

[download]
perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In reply to Re^2: subroutine function by tobyink
in thread subroutine function by truthseeker66

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