Load one js file using assetic inside Symfony2

Load one js file using assetic inside Symfony2

I am new to Symfony 2. Previously I worked a lot with Codeigniter. Now
that I am exploring assetic, I am not able to understand how I can add a
single file to the stack of JS files which are already being loaded.
I have a main page twig file which has something like this:
{% javascripts '@BlogBlogBundle/Resources/public/js/vendor/*'
output='js/combined.js' %}
<script type="text/javascript" src="{{ asset_url }}"></script>
{% endjavascripts %}
Now this works fine if all the JS files are inside the vendor folder. But
what if I have a JS file contact.js inside a folder called contact and I
want that to be visible only on contact page. So, when I added such a code
inside block body of contact page twig file
{% javascripts '@BlogBlogBundle/Resources/public/js/home/*'
output='js/home_combined.js' %}
<script type="text/javascript" src="{{ asset_url }}"></script>
{% endjavascripts %}
the contact.js is coming before all other js files which are being loaded
before the body ends.
In codeigniter, using the Carabiner library I could set up the default
files which I want to load on all pages like jQuery. And if there are any
specific file for a page, I can do that inside that particular controller.
Please let me know how I can do this inside Symfony also.