Shows that .__proto__ is not the same as .constructor.prototype

__proto__ dne constructor.prototype.js

function Parent() {}
var parent = new Parent();
function Child() {}
Child.prototype = parent;
var child = new Child();

// child inherits directly from parent. this makes sense.
console.log(child.__proto__ === parent); // true
console.log(child.__proto__ === Parent.prototype); // false

// you might think child's constructor would be Child, but it's Parent.
console.log(child.constructor === Parent); // true

// as a result, you get this
console.log(child.constructor.prototype === parent); // false
console.log(child.constructor.prototype === Parent.prototype); // true