relation factorial where factorial(0) = 1 factorial(n) = n * factorial(n - 1) when n > 0 query factorial(6)
query [x * x for x in 1..10] query [x for x in 1..30 when x % 2 == 0]
let person = {name: "Alice", age: 30} query person.name
relation double where double(x) = x * 2 assert_eq(double(5), 10)
