Creating Abstract Classes

introduction to an abstract class and its implementation using a stock trading example

Abstract classes are classes that cannot be instantiated. For instance, if we have the Shape class, we cannot do much with a generic shape until we know what kind of shape we are talking about.

Often, you have a couple of business objects on the same level. Assuming that you are not in the WET (We Enjoy Typing) group of developers, it is natural that you abstract the common functionalities into a base class. For instance, in the case of stock trading, you may have a BarChartView, a LineChartView, and a CandlestickChartView. The common functionalities related to these three views are abstracted into a ChartView. If you want to make ChartView abstract, do the following:

Level up your interview prep. Join Educative to access 80+ hands-on prep courses.

Function Scope, Block Scope, Constants

Arrow Functions

Default Arguments

Classes

Destructuring

Spread Operator and Rest Parameters

Objects in ES6

Tail Call Optimization and Other Function Features in ES6

Symbols

The for-of loop

String and Template Literals

Sets, Maps, and their Weak Versions

Iterators and Generators in Depth

ES6 Promises

Configuring ES6 with Webpack

The Reflect API

Proxies in Practice

Math and Number Extensions

ES2016

ES2017

Your Final Exam: ES6 Job Interview Questions

Bonus chapter: Your learning plan

Creating Abstract Classes