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(let map (\[f lst]
(match lst
[] []
(prepend (f (head lst)) (map f (tail lst))))))
(map (+ 1) [1 2 3])
(let foldr (\[f accumulator lst]
(match lst
[] accumulator
(f (foldr f accumulator (tail lst)) (head lst)))))
(foldr + 0 [1 2 3])
(let filter (\[pred lst]
(match lst
[] []
(match (pred (head lst))
true (prepend (head lst) (filter pred (tail lst)))
false (filter pred (tail lst))))))
(let pred (\[n]
(match n
2 true
4 true
false)))
(filter pred [0 1 2 3 4 5])
(let fibo (\[n]
(match n
0 0
1 1
(+
(fibo (- n 1))
(fibo (- n 2))))))
(fibo 10)
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