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by gatesphere 2600 days ago
If I might plug my own work:

I did a 5-part lesson on my blog. It starts from zero knowledge and ends up with two Fibonnaci calculators (one recursive, one iterative):

http://blog.suspended-chord.info/tag/lambda%20calculus/

(There's also a theorycrafting post I did a bit later to build a rudimentary object-oriented programming paradigm in the Lambda calculus.)