Exists

Code Example final class BSTNode<Value: Comparable> { var val: Value? var left: BSTNode? var right: BSTNode? init(val: Value? = nil) { self.val = val } func exists(_ val: Value) -> Bool { // 1 guard let selfVal = self.val else { return false } // 2 if self.val == val { return true } // 3 if val < self.val! { if self.left == nil { return false } return self....