Proper JavaScript classes

gistfile1.js

function makePoint(x, y) {
    "use strict";
    return {
        x: x,
        y: y,
        distanceTo: function (point) {
            var dx = this.x - point.x,
                dy = this.y - point.y;
            return Math.sqrt(dx * dx + dy * dy);
        }
    };
}

// No new
var points = [
    makePoint(9, 12),
    makePoint(3,  4)
];

console.log(points[0].distanceTo(points[1]));