ES6 inheriting from classical prototypical class

// Options: --debug --source-maps
var f = a => {
    return a + 1;
};


// Classic javascript prototypical style
function BaseTest(a) {
  this.a = a;
}

BaseTest.prototype.go = function(a) {
  this.a = a;
}

// ES6 stype  - extending a classical prototypical class
class Test extends BaseTest {
  constructor(a) {
    super(a);
  }

  dostuff(f) {
    return f + this.a;
  }

  static green() {
    return "green";
  }
}


f = new Test(22);

console.log(f.a);