(Update: Sorry for the confusion. Until Liz' update about the fact that she was talking about "m ($v) =..." in the second half of her reply, I mistook her reply to be talking about the ordinary "my ($v) = 'a';".)

Hi Liz,
I don't think "my ($v) = '';" is equivalent to "$_ =~ m/$var/ = '';" and throwing a warning.

(cmd.exe has different shell quoting!)
%perl -w -Mstrict -e "my ($v) = '';"
(no warnings)
[download]

And thus:

%perl -w -Mstrict -e "my ($v) = 'a'; print $v;"
a
[download]

which parses in my head as 'string is assigned to first element of the left hand side list'. I can't argue with the exact concepts applied by the interpreter because I forgot most about the weirder rules of context including lvalue stuff. But this seems to support the above:

%perl -w -Mstrict -e "my ($v,$s) = 'a'; print $v, $s;"
aUse of uninitialized value in print at -e line 1.
[download]

Still, string being assigned to first element of the left-hand side list. Same for lists on the right-hand side. (Which would be common usage in contrast to the above weirdness.)

%perl -w -Mstrict -e "my ($v,$s) = ('a'); print $v, $s;"
aUse of uninitialized value in print at -e line 1.
[download]

Good. As expected. Same goes for two-element lists on the rhs.

%perl -w -Mstrict -e "my ($v,$s) = ('a', 'b'); print $v, $s;"
ab
[download]

And the ',' operator has lower precedence than '=', so we get a 'useless use of a constant' error.

%perl -w -Mstrict -e "my ($v,$s) = 'a', 'b'; print $v, $s;"
Useless use of a constant in void context at -e line 1.
aUse of uninitialized value in print at -e line 1.
[download]

Hope this clarified things a little.

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.