CODEWITHSUNDEEP
perlvariablesbuilt-in
new_perl
new_perl

Reputation: 7755

When is our keyword necessary at all?

perl -e 'use strict;use warnings;$a=2;print $a'

It seems no warning is reported when I declare a global variable without our,so when is this keyword necessary?

Upvotes: 5

Views: 595

Answers (2)

Eugene Yarmash
Eugene Yarmash

Reputation: 150188

From perlvar:

   $a
   $b      Special package variables when using "sort()", see "sort" in
           perlfunc.  Because of this specialness $a and $b don't need to
           be declared (using "use vars", or "our()") even when using the
           "strict 'vars'" pragma.

Upvotes: 11

plusplus
plusplus

Reputation: 2030

$a and $b are special cases - they are reserved for sort (e.g. sort { $a <=> $b }) and shouldn't be used for your own variable names - try again using something else and see what happens!

Upvotes: 16

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