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MERN Quick Start Guide

You're reading from   MERN Quick Start Guide Build web applications with MongoDB, Express.js, React, and Node

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Product type Paperback
Published in May 2018
Publisher Packt
ISBN-13 9781787281080
Length 302 pages
Edition 1st Edition
Languages
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Author (1):
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Eddy Wilson Iriarte Koroliova Eddy Wilson Iriarte Koroliova
Author Profile Icon Eddy Wilson Iriarte Koroliova
Eddy Wilson Iriarte Koroliova
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Toc

Table of Contents (8) Chapters Close

Preface 1. Introduction to the MERN Stack 2. Building a Web server with ExpressJS FREE CHAPTER 3. Building a RESTful API 4. Real-Time Communication with Socket.IO and ExpressJS 5. Managing State with Redux 6. Building Web Applications with React 7. Other Books You May Enjoy

Introduction

Redux is a predictable state container for JavaScript applications. It allows developers to manage the state of their applications with ease. With Redux, the state is immutable. Thus, it is possible to go back and forth to the next or previous state of your application. Redux is bound to three core principles:

  • Single source of truth: All the state of your application must be stored in a single object tree within one single store
  • State is read-only: You must not mutate the state tree. Only by dispatching an action can the state tree change
  • Changes are made with pure functions: These are called reducers, which are functions that accept the previous state and an action and compute a new state. Reducers must never mutate the previous state but rather always return a new one

Reducers work in a very similar way to how the Array.prototype.reduce function does. The reduce...

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