Re^7: RFC: Tutorial: use strict; now what!?

I did change it slightly by adding my (couldn't help myself)


user$ cat foo2.pl
my $foo = 23;
my $soft = 'foo'; # soft reference
my $hard = \$foo; # hard reference
print "soft=$$soft, hard=$$hard\n";
user$ perl foo2.pl
soft=, hard=23
user$ perl -v

This is perl 5, version 14, subversion 1 (v5.14.1)
built for darwin-2level

user$ cat foo3.pl
$foo = 23;
$soft = 'foo'; # soft reference
$hard = \$foo; # hard reference
print "soft=$$soft, hard=$$hard\n";
user$ perl foo3.pl
soft=23, hard=23
[download]

I think I've learnt something about 'my' too!

Comment on Re^7: RFC: Tutorial: use strict; now what!? Download Code

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Re^8: RFC: Tutorial: use strict; now what!? by educated_foo (Vicar) on Feb 09, 2012 at 17:53 UTC
That's your problem: `my` makes a variable lexical, and symbolic references only work with dynamic/global variables. BTW, this is also why mixing `eval STRING` with lexicals is problematic: `foobar:perl/blead% perl -le '$y="print \$x"; $z=sub { my $x=23; $y}; e +val $z->()' foobar:perl/blead% perl -le '$y="print \$x"; $z=sub { $x=23; $y}; eval + $z->()' 23` [download]	[reply] [d/l] [select]