03_functions.cml

// Functions, recursion, pipelines and `with` parameters.
// Run: camel docs/tutorial/examples/03_functions.cml

func square(x: int): int {
    return x * x
}

func fib(n: int): int {
    return if n <= 1 then n else fib(n - 1) + fib(n - 2)
}

// A tail-recursive sum: this is how Camel writes a loop.
func sum_to(n: int, acc: int): int {
    return if n == 0 then acc else sum_to(n - 1, acc + n)
}

// `with` parameters configure a function; ordinary parameters flow through it.
with <factor: int>
func scale(x: int): int {
    return x * factor
}

func main(): int sync {
    println(square(7))
    println(fib(20))
    println(sum_to(100000, 0))
    println(scale<3>(5))
    println(5->square->scale<2>)     // the same as scale<2>(square(5))
    return 0
}