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Re^3: no uninitialized warnings

by bronto (Priest)
on Aug 25, 2004 at 16:14 UTC ( [id://385718]=note: print w/replies, xml ) Need Help??


in reply to Re^2: no uninitialized warnings
in thread no uninitialized warnings

Mh... something like this?

@x=(1..3) ;
undef $x[1] ;
$_ = defined $_? $_: '[__UNDEF__]' for @x ;
print "@x" ;

[download]

Ciao!
--bronto

The very nature of Perl to be like natural language--inconsistant and full of dwim and special cases--makes it impossible to know it all without simply memorizing the documentation (which is not complete or totally correct anyway).
--John M. Dlugosz

Replies are listed 'Best First'.
Re^4: no uninitialized warnings
by ccn (Vicar) on Aug 25, 2004 at 16:46 UTC

    or like this: 

    $_ = '[undef]' for grep !defined, $var1, $var2, $var3;
print "$var1, $var2, $var3";

    [download]

    Update: I forgot that changing the values can affect program logic(as Aristotle mentioned). So, the best approach (imho) is just print with warnings or 

    use Data::Dumper;
print Data::Dumper->Dump([$var1, $var2, $var3], [qw(var1 var2 var3)]);

    [download]
[reply]
[d/l]
[select]

      Or non-destructively and unambiguously:

      print join " ", map { defined() ? "'\Q$_\E'" : 'undef' } $var1, $var2,
+ $var3;

      [download]

      Makeshifts last the longest.

[reply]
[d/l]

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