Classical Inheritance in JavaScript : Reassigning the constructor -

i trying learn inheritance in javascript using prototype keyword.

i came code across web-site explained me classical inheritance in javascript. using mozilla rhino command-line javascript

this code

    var fn55 = function(){      var employee = function(name){          var name = name;          this.getname = function(){             return name;         };          this.setname = function(empname){             name = empname;         };       };      var contractemp = function(name,sal){         var salary = sal;          this.getsalary = function(){             return salary;         }         //calling super constructor         employee.apply(this,[name]);                 };     contractemp.prototype = new employee();     contractemp.prototype.constructor = contractemp;       var emp1 = new contractemp("jack",3000);     var emp2 = new contractemp("john",4000);     print(emp1.getname());     print(emp2.getname());     print(emp1.getname());      employee.prototype.getinfo = function(){         return "emp name \""+this.getname()+"\" salary "+this.getsalary();     }      print(emp1.getinfo()); };  fn55(); 

the output

jack john jack emp name "jack" salary 3000 

now if comment line in code

//contractemp.prototype.constructor = contractemp; 

the output remains is.

so question is, whats purpose of re-assigning constructor

so question is, whats purpose of re-assigning constructor

the purpose reset constructor original value.

see what significance of javascript constructor property?