Perl has various ways to transfer control out of the normal flow: die()
, goto()
, return()
, next
, last
, and redo
are among the sorts of things I mean. Not all of these are suitable for all circumstances, and Perl issues an exiting
warning for unsuitable cases.
Sometimes, though, you just ne…
My blog post My Favorite Warnings: redundant
and missing
touched on the use of the if
module. Comments on that post made me think it deserved a top-level treatment, expanding on (though not necessarily improving on) Aristotle's comment.
The ="prettyp…
The redundant
and missing
warnings were added in Perl 5.22 to cover the case where a call to the printf
or sprintf
had more (redundant
) or fewer (/users/tom_wyant/2021/09/index.html
The Perl compiler wants to help us write clean code. One of the ways that it does this is to issue warnings when a global variable appears ony once: Name "main::Foo" used only once: possible typo at ...
The thing is, sometimes this is not an error. For example, we may want to refer to a global variable in another package, one that was not imported into our namespace.
I have seen various expedients used to avoid this warning in CPAN code. Something like $Foo::Bar = $Foo::Bar = 42;
is fairly typical. Sometimes thi…