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7.1 Defining Subroutines

Defining a subroutine is quite easy. You use the keyword sub, followed by the name of your subroutine, followed by a code block. This friendly subroutine can be used to greet the user:

use strict;
sub HowdyEveryone {
   print "Hello everyone.\nWhere do you want to go with Perl today?\n";
}

Now, anywhere in the code where we want to greet the user, we can simply say:

&HowdyEveryone;

and it will print that message to the user. In fact, in most cases, the & for invoking subroutines is optional.

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