Today, we are going to be building a calculator app using vanilla JavaScript . No jQuery or other third party libraries/frameworks involved. I’m even going to make it more complicated by using objects and prototypical inheritance, so do not expect a quick and dirty job. Here’s a demo of what we’ll be building.

We’ll build a Calculator “class”, which will take care of the application logic. This Calculator, will have methods that we can access to pass it numbers, operations and all sorts of cool stuff that’s it.