Class definition example

gistfile1.js

class Point {
  <closed, prototype: Object.prototype>,

  class method fromString(s) {
    return new Point(parse(s));
  },

  private method repaint() {
    console.log('moved!');
  },
  
  new (x, y) {
    this.x = x;
    this.y = y;
  },

  method move(x, y) {
    this.x = x;
    this.y = y;
    this.repaint();
  }
}

class Point3D {
  <frozen: class, sealed: prototype, superclass: Point>,

  get z(val) {
    if (val === undefined) {
       val = 0;
    }
    return val;
  },

  new (x, y, z) {
    super(x, y);
    this.z = z;
  }
}

// This can also be used to create complex objects
var o = {
  <prototype: Array.prototype, frozen>,
  
  get x(val) {
    return 2;
  },
  set x(val) {
    throw new Error("read only property");
  }
}