In this episode of Syntax, Scott teaches Wes about Svelte and Sapper — general premise, best practices, and more! Sanity - Sponsor Sanity.io is a real-time headless CMS with a fully customizable Content Studio built in React. Get a Sanity powered site up and running in minutes at sanity.io/create. Get an awesome supercharged free developer plan on sanity.io/syntax. Stackbit - Sponsor Build modern JAMStack websites in minutes. Stackbit lets you combine any theme, site generator and CMS without complicated integrations. Join the beta today by visiting stackbit.com/syntaxfm. Show Notes 03:14 - General premise Sapper compiles away, removing framework code from build Component & Props based Easy reactivity Built-in tools like animation Template-based 07:57 - Svelte 101 .svelte files Files can include , , and straight-up CSS Variables are used in templates via {var} - even works Import component and use just like React and Vue 10:49 - Stylin’ All styles are scoped by default global() to wrap around global declarations Language type sass to use sass 12:22 - Reactivity Baked in let count = 0 count = count + 1 will reactively update in template variables are essentially state $: double = count + 2 - to create a reactive variable that updates when another variable updates $: console.log(count) = will run whenever count is update a-la useEffect $: if (count >10) = same… reactive if  updates let name in script 15:55 - Props Same was React, but need to be exported before they can be used Seems counterintuitive, but you get over it quickly EZ defaults export let answer = 'a mystery'; import Nested from './Nested.svelte'; export let answer = 'a mystery'; The answer is {answer} 20:08 - Template logic If statements {#if user._id} {/if} Loops {#each cats as kittens} Promise tags {#await promise} ...waiting {:then number} The number is {number} {:catch error} {error.message} {/await} 23:12 - Events On directive Functions can also be inline Modifiers Click me 26:11 - Baked-in goodies Animation Dimensions {text} Lifecycle methods Advanced State Via Stores A store is simply an object with a subscribe method that allows interested parties to be notified whenever the store value changes. import { writable } from ‘svelte/store’; export const count = writable(0); count.update(0) Slots React helmet like stuff, ie 36:39 - Sapper Similar to Next.js Folder routes Static export with all of the good stuff like service workers and preloading Links Svelte Sapper r/webdev Vue.js ScottTolinski.com WesBos.com Next.js ScottTolinski.com Github Repo Gatsby.js Shawn Swyx ××× SIIIIICK ××× PIIIICKS ××× Scott: Lewisia Battery Backup Solar Fountain Pump Wes: Firefox Containers Shameless Plugs Scott: LevelUpTuts YouTube Channel Wes: Wes’ New Website 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