Solution Review: Color Wheel

In the following lesson, we will go over the solution of the challenge: Color Wheel.

We'll cover the following

Task

In this challenge, you were provided a primary color and you had to match it to its complementary secondary color.

Solution

Let’s go over the solution step-by-step.

  • The first thing you had to figure out is that this problem requires a match expression.

  • Next, you had to figure out the number of cases the match expression would require to cover all the possible scenarios. We had one case for each primary color along with a default case if the input was anything but a primary color.

case "blue" => print("orange")
case "yellow" => print("purple")
case "red" => print("green")
case _ => print("not a primary color")

You can find the complete solution below:

You were required to write the code from line 3 to line 8.

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var testVariable = "red"
testVariable match {
  case "blue" => print("orange")
  case "yellow" => print("purple")
  case "red" => print("green")
  case _ => print("not a primary color")
}

In the next lesson, we will complete our discussion on control structures with types of patterns.