Define object method in javascript

Question

I want to make my custom object in javascript. I have made a method in my object to make value uppercase but it is not working. fiddle

function mystring (name,uppercase){
this.name= name;
this.uppercase= function (){
return this.toUpperCase();
};
}
var jj= new mystring('mycompany');
 jj=jj.uppercase();
console.log(jj)

Answer 1

You need to do

function mystring (name,uppercase){
 this.name= name;
 this.uppercase= function (){
 return this.name.toUpperCase();
 };
}
var jj= new mystring('mycompany');
jj=jj.uppercase();
console.log(jj);

You forgot the this.name in the this.uppercase function

Answer 2

You are trying to convert to the entire object to upper case, if you check the console it tells you that the element has no method toUpperCase. Instead convert the string, not the object.

return this.name.toUpperCase();