I try demonstrate inheritance with immediately invokable function expression(IIFE) and prototype in the following code.

This sample code is written in different concepts you should read the following posts as well.

JavaScript Prototype Inheritance with function declaration and expression in ES5

JavaScript Class, Inheritance, Override in ES6

The following code demonstrate classic inheritance with JavaScript.

Same code as shown in the above, but I added a new function named inherit in global Function.prototype so that we don't need to write same code for inheritance. It looks like Employee.inherits(Person); or Manager.inherits(Employee);

Notice that although Employee and Manager functions doesn't have inherits function, it works due to global Function.prototype.inherits

ES6, also known as ECMAScript2015, introduced classes. Notice that classes are used in order to use inheritance.

This sample code is written in different concepts you should read the following posts as well.

JavaScript Prototype Inheritance with function declaration and expression in ES5

JavaScript Prototype Inheritance with IIFE in ES5

Presumably this demo looks more friendly to you 🙂 actually I think so. But don't forget that no magic here still, this code is also transpiled(or compiled) to ES5 for browser compatibility.