arrow methods 2

// uses arrow functions to define methods seperatly from data, like an alternative to .prototype.

var x=function(){
  return {  // public methods:
    get: ( )=> this.val,
    set: (v)=> this.val=v,
  };
}.call({ // private state:
 val: 902
});

x.get(); // 902
x.val;   // undefined