Where will function below statements be stored in a prototype of that function

Question

   function b(){
     this.var = 20;
     ele = 10;
   }
   let a = new b()

Because i can see neither ele nor this.var is stored in the b.prototype constructor.

Answer 1

If you want to store a property on a prototype just add it via "prototype"

function b(){
 this.var = 20;  
}
b.prototype.ele = 10;

let a = new b();

You will be able to access it directly through the created instance "a"

a.ele //will return 10

Remember that prototype is a single object, so every instance created with the same constructor will link to a single prototype.

Every instance has it's own scope, but shares a single prototype. It is important from performance perspective.