I found this tutorial a little more approachable: http://rise4fun.com/Fast/tutorial/guide http://rise4fun.com/Fast/tutorial/guide Fast! is a Microsoft Research

I found this tutorial a little more approachable: http://rise4fun.com/Fast/tutorial/guide http://rise4fun.com/Fast/tutorial/guide Fast! is a Microsoft Research language for tree transforms, the cool part is the "deforestation" where a sequence of functions can be transformed in to a single function. What makes this cool is it isn't "runtime" composition; the generated C# code does the transformation in a single pass. For example a sequence of maps and filters would only loop over the list once.