At least one of the inspirations of Moose, was the object system of Perl 6 at the time (now Raku https://raku.org using the #rakulang tag on social media). To create a Point class that has an x and a y attribute, you'd write:

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

Object instantiation is then done with:

    Point.new(x => 42, y => 666);