javascript / beginner
Snippet
Reactive Declarations with $:
In Svelte, you can create reactive variables using the $: syntax. These variables automatically re-calculate whenever any of the values they depend on change.
snippet.js
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<script>let count = 0;$: doubled = count * 2;</script><button on:click={() => count++}>Count is {count}</button><p>Double is {doubled}</p>
svelte
Breakdown
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let count = 0;
Initializes a standard variable that Svelte tracks for changes.
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$: doubled = count * 2;
The $: mark tells Svelte to re-run this line whenever 'count' changes.