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

by tangent (Parson)
on Feb 09, 2012 at 17:29 UTC ( [id://952792]=note: print w/replies, xml ) Need Help??


in reply to Re^6: RFC: Tutorial: use strict; now what!?
in thread 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
I think I've learnt something about 'my' too!

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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

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