Perl module: Difference between revisions

Revision as of 12:04, 13 July 2013

Revision as of 12:05, 13 July 2013

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==Perl packages and namespaces==

A running Perl program has a built-in [[Namespace (computer science)|namespace]] called "<code>main</code>", which is the default name. For example a subroutine called <code>Sub1</code> can be called as <code>Sub1()</code> or <code>main::Sub1()</code>. With a variable the appropriate [[Sigil (computer programming)|sigil]] is placed in front of the namespace; so a scalar variable called <code>$var1</code> can also be referred to as <code>$main::var1</code>, or even <code>$::var1</code>. Other namespaces can be created at any time.

<source lang="perl">

package Namespace1;