Positive Number In Array: Buggy Code in Scala

Inside the code editor we've tried to write a function that takes an array nums as argument and returns true if there exists at least one positive (greater than zero) number in the array; returns false otherwise.

So when we called the function for [-1, 2, 3], we expected our program to print:

Array has positive numbers

but it seems like we made a mistake because our code doesn't even compile. The compiler reports:

Type Mismatch Error
Found:    Unit
Required: Boolean

Assignment:

Your task is to fix our function.