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


The story of MobX revolves around observables. Actions mutate these observables. Derivations and Reactions observe and react to changes to these observables. Observables, actions, and reactions form the core triad.

We have seen several ways to shape your observables with objects, arrays, maps, and boxed observables. Actions are the recommended way to modify observables. They add to the vocabulary of operations and boost performance by minimizing change notifications. Reactions are the observers that react to changes in observables. They are the ones causing side-effects in the app.

Reactions come in three flavors, autorun(), reaction(), and when(), and distinguish themselves as being long-running or one-time. when(), the only one-time effector, comes in a simpler form, where it can return a promise, given a predicate function.