Just use the :coffeescript filter...
!!!
%html
%head
%body
:coffeescript
sum = (a, b) -> a + b
foo = sum 1, 2
so treat "coffeescript" as a filter like javascript.
http://scalate.fusesource.org/documentation/jade.html
http://scalate.fusesource.org/documentation/scaml-reference.html#filters
--
James
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Open Source Integration and Messaging