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The $[ Special Variable in Perl
Perl provides numerous special variables, which have their predefined meaning.
We have a special variable, which is written as $[. This special variable is a scalar containing the first index of all arrays. Because Perl arrays have zero-based indexing, $[ will almost always be 0. But if you set $[ to 1 then all your arrays will use on-based indexing. It is recommended not to use any other indexing other than zero. However, let's take one example to show the usage of $[ variable −
Example
#!/usr/bin/perl # define an array @foods = qw(pizza steak chicken burgers); print "Foods: @foods\n"; # Let's reset first index of all the arrays. $[ = 1; print "Food at \@foods[1]: $foods[1]\n"; print "Food at \@foods[2]: $foods[2]\n";
Output
This will produce the following result −
Foods: pizza steak chicken burgers Food at @foods[1]: pizza Food at @foods[2]: steak
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