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Messages

You can attach a message to an exception to give context to whoever sees the program crash as to why that happened.

You do this by putting a String in the parentheses when throwing your exception.

void crashesOnFive(int x) {
    if (x == 5) {
        throw new RuntimeException("5 is an evil number");
    }
}

void main() {
    crashesOnFive(1);
    IO.println("Made it to step 1");

    crashesOnFive(5);
    IO.println("Will not make it to step 2");
}