Book Image

Full-Stack React, TypeScript, and Node

By : David Choi
2 (1)
Book Image

Full-Stack React, TypeScript, and Node

2 (1)
By: David Choi

Overview of this book

React sets the standard for building high-performance client-side web apps. Node.js is a scalable application server that is used in thousands of websites, while GraphQL is becoming the standard way for large websites to provide data and services to their users. Together, these technologies, when reinforced with the capabilities of TypeScript, provide a cutting-edge stack for complete web application development. This book takes a hands-on approach to implementing modern web technologies and the associated methodologies for building full-stack apps. You’ll begin by gaining a strong understanding of TypeScript and how to use it to build high-quality web apps. The chapters that follow delve into client-side development with React using the new Hooks API and Redux. Next, you’ll get to grips with server-side development with Express, including authentication with Redis-based sessions and accessing databases with TypeORM. The book will then show you how to use Apollo GraphQL to build web services for your full-stack app. Later, you’ll learn how to build GraphQL schemas and integrate them with React using Hooks. Finally, you’ll focus on how to deploy your application onto an NGINX server using the AWS cloud. By the end of this book, you’ll be able to build and deploy complete high-performance web applications using React, Node, and GraphQL.
Table of Contents (22 chapters)
Section 1:Understanding TypeScript and How It Can Improve Your JavaScript
Section 2: Learning Single-Page Application Development Using React
Section 3: Understanding Web Service Development Using Express and GraphQL
Chapter 16: Adding a GraphQL Schema – Part II

Learning about ES6 variable types and JavaScript scoping

In this section, we will learn about JavaScript's scoping rules and some new variable types that help to clarify and improve upon some issues regarding these scope rules. This information is valuable since you will be creating variables constantly throughout your career as a software developer, and it is important to understand under what scope a variable can be accessed and under what circumstances it may be changed.

In most other languages, variable scoping happens within any arbitrary set of brackets or begin end scope statements. However, scope in JavaScript is handled by the body of a function, which means when a variable is declared inside a function body using the var keyword, that variable is only accessible within that body. Let's take a look at an example of this. Create a new file called functionBody.ts and add the following code to it:

if (true) {
    var val1 = 1;
function go...