Javascript call the base class constructor

Question

Person is base class and Emp inherits from Person. I am trying to use name, location properties of Person in Emp.

function Person(name, location){
   this.name = name;
   this.location = location;
}

Person.prototype.getName = function(){
   return 'Name: ' + this.name;
}

function Emp(id, name, location){
     this.id = id;
     Person.call(this, name);
     Person.call(this, location);
}

Emp.prototype = Object.create(Person.prototype);

var e1 = new Emp(1, 'John', 'London');
e1.id   // 1
e1.name // 'London'
e1.location //undefined

What is causing this error and why is name taking value of London?

plalx · Accepted Answer · 2016-01-15 22:43:22Z

3

Why are you calling the constructor twice with a single argument?

function Emp(id, name, location){
     this.id = id;
     Person.call(this, name, location);
}

answered Jan 15, 2016 at 22:43

plalx

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