Course of Raku / Objects, I/O, and exceptions / Classes and objects / Attributes / Exercises / A counter

Solution: A counter

Here is a possible solution to the task.

Code

class Counter {
    has $.count is rw = 0;
}

my $c = Counter.new;
say $c.count;

$c.count++ for ^5;

say $c.count;

🦋 You can find the source code in the file counter.raku.

Output

0
5

Comments

The attribute is declared is rw so that its accessor returns a writable container, and = 0 gives it a starting value. The first say confirms a fresh counter really does begin at that default, 0.
Because the accessor is writable, incrementing it with ++ works as expected.

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