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MobX Quick Start Guide

You're reading from  MobX Quick Start Guide

Product type Book
Published in Jul 2018
Publisher Packt
ISBN-13 9781789344837
Pages 236 pages
Edition 1st Edition
Languages
Authors (2):
Pavan Podila Pavan Podila
Profile icon Pavan Podila
Michel Weststrate Michel Weststrate
Profile icon Michel Weststrate
View More author details
Toc

Observables


Data is the lifeblood of your UI. Going back to the equation that defines the relationship between data and UI, we know that the following is true:

So, it makes sense to focus on defining the structure of data that will drive the UI. In MobX, we do this with the observables. Take a look at this diagram:

Observables, as the name suggests, are entities that can be observed. They keep track of changes happening to their values and notify all the observers. This seemingly simple behavior has powerful implications when you start designing the structure of your client-state. In the preceding diagram, every circle represents an Observable, and every diamond is an Observer. An observer can observe one or more observables and get notified when any of them change value.

Creating observables

The simplest way to create an observable is to use the observable() function. Take a look at the following:

const item = observable({
name: 'Party Balloons',
itemId: '1234',
quantity: 2,
price: 10,
coupon...
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