Dive into the world of Svelte and Sapper as Scott introduces Wes to their innovative features! Learn how Svelte compiles down to efficient code, easing the development process. Discover the unique reactivity model that simplifies state management and component styling. The duo also explores Sapper's strengths in server-side rendering and routing. Plus, stay tuned for clever tech picks and insights on outdoor solar lighting and lawn care that add a fun twist to the tech talk!
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insights INSIGHT
Simplified HTML Attributes
Svelte's template language simplifies HTML attribute usage.
Directly use {src} in image tags instead of src={src}, reducing redundancy.
insights INSIGHT
Svelte Reactivity
Svelte's reactivity simplifies state management.
Updating a variable directly updates the UI, eliminating setState and useEffect.
volunteer_activism ADVICE
Using Props in Svelte
Export props in child components to define and use them with default values.
This simplifies prop usage compared to destructuring in React.
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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
Syntax - Tasty Web Development Treats