Challenge: Write your First Higher-Order Function

Test yourself and implement what you have learned so far in this challenge.

We'll cover the following

Problem Statement

You need to create a higher-order function arithmeticPrinter which prints the result of an arithmetic function that has two parameters of type Int and returns a value of type Int.

In this challenge, you will assume that the following arithmetic functions have been declared:

def add(a: Int, b: Int): Int = {
  a + b
}

def subtract(a:Int, b:Int) = {
  a - b
}

def multiply(a:Int, b:Int) = {
  a * b
}

def divide(a:Int, b:Int) = {
  a / b
}

For instance, the arithmeticPrinter will take the add function as input and print its result.

Input

arithmeticPrinter has three parameters.

  1. A function f which has two parameters of type Int and returns a value of type Int.
  2. An integer x
  3. An integer y

The input will be a function and two integers that will be passed to the function.

Output

The output will be the result of the arithmetic function.

Sample Input

add, 4, 9

Sample Output

13

Test Yourself

Write your code in the given area. Try the exercise by yourself first, but if you get stuck, the solution has been provided. Good luck!

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def arithmeticPrinter(f: (Int , Int) => Int, x: Int, y: Int) = {
    
  print(" ") // Write your own code in the print statement
}

Let’s go over the solution review in the next lesson.