In this episode of Syntax, Scott teaches Wes about Svelte and Sapper — general premise, best practices, and more!
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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
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