Challenges

Remember the rules for this are

• Try to use only the information given up to this point in this book.
• Try not to give up until you've given it a solid attempt

Challenge 1.

Make an enum named Response which has three variants. YES, NO, and MAYBE_SO.

// -------------
// CODE HERE
// -------------

void main() {
    IO.println(
        Response.YES
    );

    IO.println(
        Response.NO
    );

    IO.println(
        Response.MAYBE_SO
    );
}

Challenge 2.

Write a method named goodPerformer which takes in a String representing the name of an artist.

If that String is equal to Pitbull or Billy Joel return YES. If it is equal to Shaggy return NO. Otherwise return MAYBE_SO.

Use the enum you defined above.

// ------------
// CODE HERE
// ------------

void main() {
    Response pitbull = goodPerformer("Pitbull");
    IO.println(pitbull);

    Response billyJoel = goodPerformer("Billy Joel");
    IO.println(billyJoel);

    Response shaggy = goodPerformer("Shaggy");
    IO.println(shaggy);

    Response chappelRoan = goodPerformer("Chappell Roan");
    IO.println(chappelRoan);
}

Challenge 3.

Make a method named transition which takes in a StopLight and returns the next light it will transition to.

For those who don't drive cars: red lights go to green, green lights go to yellow, and yellow lights go to red.

enum StopLight {
    RED,
    YELLOW,
    GREEN
}

StopLight transition(StopLight current) {
    // ------------
    // CODE HERE
    // ------------
}

void main() {
    var light = StopLight.RED;
    IO.println(light);

    light = transition(light);
    IO.println(light);

    light = transition(light);
    IO.println(light);

    light = transition(light);
    IO.println(light);

    light = transition(light);
    IO.println(light);

    light = transition(light);
    IO.println(light);

    light = transition(light);
    IO.println(light);
}