improvate #evaluate example

---------- Forwarded message ----------
From: Luan Nguyen <luan.min.nguyen@gmail.com>
Date: Mon, Oct 22, 2007 at 8:56 PM
Subject: Evaluate Section
To: dev@velocity.apache.org

Hello,In the Evaluate section, there are two different variables: $source1
and $source. How can it display "abc" when $source is never defined?

Evaluate

The #evaluate directive can be used to dynamically evaluate VTL. This
allows the template to evaluate a string that is created at render time.
Such a string might be used to internationalize the template or to include
parts of a template from a database.

The example below will display abc.

#set($source1 = "abc")
#set($select = "1")
#set($dynamicsource = "$source$select")
#evaluate($dynamicsource)

---------- Forwarded message ----------
From: Will Glass-Husain <wglasshusain@gmail.com>
Date: Tue, Oct 23, 2007 at 9:55 AM
Subject: Re: Evaluate Section
To: Velocity Developers List <dev@velocity.apache.org>

That's a good point though. Perhaps the example should use concatenation to be clearer. The single quotes prevent evaluation.

#set($dynamicsource = '$source' + "$select")

WILL