In this episode of Syntax, Scott and Wes talk about state in React: local state, global state, UI state, data state, caching, API data and more! LogRocket - Sponsor LogRocket lets you replay what users do on your site, helping you reproduce bugs and fix issues faster. It’s an exception tracker, a session re-player and a performance monitor. Get 14 days free at logrocket.com/syntax. Freshbooks - Sponsor Get a 30 day free trial of Freshbooks at freshbooks.com/syntax and put SYNTAX in the “How did you hear about us?” section. Show Notes 3:38 - What is state? 4:58 - What kind of things are kept in state? Data Temporary client side data From forms, button clicks, etc. Cached server data Data from API UI status AKA isModalOpen isToggled 12:48 - Global state vs. Local state Ask yourself: does the data need to be accessed outside this component? If data does need to be accessed a little higher, you can simply move where that state lives. React calls this “lifting state”. Do you count Apollo API calls as global state? 21:15 - Managing Local state useState, setState Passing state & update functions down State machines 31:12 - Approaches to Global state Redux Complicated, hard to learn Very useful, organized and structured Actions, reducers and more Time traveling do to nature of store Immutability Tons of Redux based hooks libs Mobx Based on Observables An Observable is like a Stream and allows to pass zero or more events where the callback is called for each event. Often Observable is preferred over Promise because it provides the features of Promise and more. Context Functions just work and update global state. Downside is there are no fancy tools Apollo Apollo quires for data in global cache Apollo client for global UI state Not quite there, isn’t super elegant Links Thinkso Learn Node! Meteor Session xstate-react React Context Mobx easy-peasy hype.codes providerCompose.js Relay React Podcast ××× SIIIIICK ××× PIIIICKS ××× Scott: Command Line Heroes Wes: MASSDROP CTRL MECHANICAL KEYBOARD Shameless Plugs Scott: LevelUpTutorials - Gatsby Ecommerce — Subscribe before price goes up! Wes: All Courses — Use the coupon code ‘Syntax’ for $10 off! Tweet us your tasty treats! Scott’s Instagram LevelUpTutorials Instagram Wes’ Instagram Wes’ Twitter Wes’ Facebook Scott’s Twitter Make sure to include @SyntaxFM in your tweets