Re: A curious case of of my()

[kilocoder]

in reply to A curious case of of my()

$href is empty, since it is not passed into foo. hence @array ends up being a package variable and not a lexical variable.
your code

sub foo{
        my $var = shift;
        my $href = shift;
        my @array = $href->{pass_in} if defined $href and exists $href
+->{pass_in};
        push @array, $var;

        print "contents : @array\n";
}

foo(1);
foo(2);

This gives
contents : 1
contents : 1 2

However, commenting out the unused href code and declaring array as a lexical like:

sub foo{
        my $var = shift;
        my @array; 
        #my $href = shift;
        #my @array = $href->{pass_in} if defined $href and exists $hre
+f->{pass_in};
        push @array, $var;

        print "contents : @array\n";
}

foo(1);
foo(2);

gives

contents : 1
contents : 2

[shmem]

$href is empty, since it is not passed into foo. hence @array ends up being a package variable and not a lexical variable.

As others have pointed out, that's wrong. my creates lexicals at compile time. It doesn't have a our fallback. The 'if' modifier with a false condition inhibits the opcode which clears the lexical at runtime.

our @array; # package vaiable
@array = qw( foo bar );

sub foo{
        my $var = shift;
        my $href = shift;
        my @array = $href->{pass_in} if defined $href and exists $href
+->{pass_in};
        push @array, $var;

        print "contents : @array\n";
}

print "outer scope - contents : @array\n";

foo(1);
foo(2);

print "outer scope - contents : @array\n";

__END__
outer scope - contents : foo bar
contents : 1
contents : 1 2
outer scope - contents : foo bar

As you can see, the variable @array inside the sub is a lexical.