Template::Plugin::Assert - trap undefined values

       Andy Wardley <abw@wardley.org> <http://wardley.org/>

       Copyright (C) 2008 Andy Wardley.  All Rights Reserved.

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.

       This plugin defines the "assert" virtual method that can be used to automatically throw errors when
       undefined values are used.

       For example, consider this dotop:

           [% user.name %]

       If "user.name" is an undefined value then TT will silently ignore the fact and print nothing.  If you
       "USE" the "assert" plugin then you can add the "assert" vmethod between the "user" and "name" elements,
       like so:

           [% user.assert.name %]

       Now, if "user.name" is an undefined value, an exception will be thrown:

           assert error - undefined value for name

       Template::Plugin::Assert - trap undefined values

       Template::Plugin

perl v5.40.0                                       2024-10-20                      Template::Plugin::Assert(3pm)

           [% USE assert %]

           # throws error if any undefined values are returned
           [% object.assert.method %]
           [% hash.assert.key %]
           [% list.assert.item %]