__proto__ VS. prototype in JavaScript

Question

This figure again shows that every object has a prototype. Constructor function Foo also has its own __proto__ which is Function.prototype, a

Answer 1

(function(){ 
      let a = function(){console.log(this.b)};
      a.prototype.b = 1;
      a.__proto__.b = 2;
      let q = new a();
      console.log(a.b);
      console.log(q.b) 
    })()

Try this code to understand