Episode Details

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 St