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// Simplest
f := fn {}
f()
// Simple param
f2 := fn a: int {}
f2(1)
// Return value
f3 := fn -> int {
ret 3
}
f3() <=> 3
// Combined
f4 := fn a: int -> int {
ret a + a
}
f4(2) <=> 4
// Multiple arguments
adder := fn a: int, b: int -> int {
ret a + b
}
adder(1, 2) <=> 3
// calls inside calls
adder(f3(), f3() + 1) <=> 7
// Passing functions
h := fn -> int {
ret 1
}
g := fn f: fn -> int -> int{
ret f()
}
g(h) <=> 1
// multiple returns
q := fn i: int -> int {
if i == 1 {
ret 2
} else {
ret 3
}
}
q(1) <=> 2
q(0) <=> 3
// mixing function and value types
f5 := fn a: fn -> int, b: int -> int {
ret a() + b
}
f5_inner := fn -> int {
ret 1
}
f5(f5_inner, 2) <=> 3
// factorial := fn n: int -> int {
// if n <= 1 {
// ret 1
// }
// ret n * factorial(n - 1)
// }
// factorial(5) <=> 120
// factorial(6) <=> 720
// factorial(12) <=> 479001600
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