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LESSON 6.4

Enums with Data

Each enum variant can carry its own data. A match extracts that data, as in Shape.Rect(w, h) => w * h .

Goal Complete area so it prints 10 12 0 .

Write a Zirk program, then run it to see the world react.

Your code

main.zirk

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Zirk

import { stdout } from std.io;

enum Shape { Circle(r: Int32), Rect(w: Int32, h: Int32), Dot }

fn area(s: Shape): Int32 {
    return match s {
        Shape.Circle(r) => r * r * 3
    };
}

fn main(): Void {
    stdout.println(area(Shape.Rect(w: 2, h: 5)), area(Shape.Circle(r: 2)), area(Shape.Dot));
}

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Output

Your program output will appear here.

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