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 utility functions of mobx-utils

mobx-utils provides a variety of utility functions that can simplify programming tasks in MobX. You can install mobx-utils using npm or yarn:

$ npm install mobx-utils

In the rest of this section, we will focus on some utilities that are frequently used. These include the following:

  • fromPromise()
  • lazyObservable()
  • fromResource()
  • now()
  • createViewModel()


Visualizing async-operations with fromPromise()

Promises, a way of life in JavaScript, are great for dealing with asynchronous operations. When representing the state of operations on the React UI, we have to ensure each of the three states of a promise is handled. This includes the state when the promise is pending (operation in progress), fulfilled (operation completed successfully), or rejected (in case of failures). fromPromise() is a convenient way to handle a promise, and gives a nice API to visually represent the three states:

newPromise = fromPromise(promiseLike)

promiseLike: instance of Promise or (resolve...