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

Solution: A point class

Here is a possible solution to the task.

Code

class Point {
    has $.x;
    has $.y;
}

my $a = Point.new(x => 3, y => 4);
my $b = Point.new(x => 0, y => 0);

my $dist = sqrt(($a.x - $b.x) ** 2 + ($a.y - $b.y) ** 2);
say $dist;

🦋 You can find the source code in the file point-class.raku.

Output

5

Comments

1. The two has $.x and has $.y declarations create the attributes together with their read accessors.

2. Each object stores its own x and y, so $a and $b report different coordinates even though they are the same kind of object. This independence is the whole point of attributes — each instance carries its own data.

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