Book Image

MobX Quick Start Guide

By : Pavan Podila, Michel Weststrate
Book Image

MobX Quick Start Guide

By: Pavan Podila, Michel Weststrate

Overview of this book

MobX is a simple and highly scalable state management library in JavaScript. Its abstractions can help you manage state in small to extremely large applications. However, if you are just starting out, it is essential to have a guide that can help you take the first steps. This book aims to be that guide that will equip you with the skills needed to use MobX and effectively handle the state management aspects of your application. You will first learn about observables, actions, and reactions: the core concepts of MobX. To see how MobX really shines and simplifies state management, you'll work through some real-world use cases. Building on these core concepts and use cases, you will learn about advanced MobX, its APIs, and libraries that extend MobX. By the end of this book, you will not only have a solid conceptual understanding of MobX, but also practical experience. You will gain the confidence to tackle many of the common state management problems in your own projects.
Table of Contents (17 chapters)
Title Page
Packt Upsell


Observables and actions keep things within the confines of the MobX reactivity system. Actions mutate the observables and, through the power of notifications, the rest of the MobX system aligns to the mutation to keep the state consistent. To start making a change outside of this MobX system, you need reactions. It is the bridge to the outside world that informs the state-changes happening within the MobX world. 

Consider reactions to be the reactive-bridge-crossing between MobX and  the outside world. These are also the side effect producers of your application.

We know that reactions come in three flavors: autorun, reaction, and when. These three flavors have distinct characteristics that tackle the various scenarios within your app.

When determining which one to pick, you can apply this simple decision-making process:

Each of the reactions give you back a disposer-function, which can be used to prematurely dispose the reaction thus:

import { autorun, reaction, when } from 'mobx'...