How to access JavaScript function which is in function which is in function

Question

Is there any way to access a function which is inside a function, which is inside an other function in JavaScript?

function x(name, age) {
  this.name = name;
  this.age = age;


  this.a = function() {
    this.b = function() {
      return "b";
    };

    return "a";
  };
}

var xobj = new x('vin', 25);
console.log(xobj.a.b()); //error

Answer 1

you can do

function x(name, age){
 this.name  =name;
 this.age = age;
 

 this.a = function(){
			
		this.b = function(){
			return "b";
        };

	return "a";
  };
  
}


var xobj =new x('vin',25);
var xx = new xobj.a();
console.log(xx.b());