How do you update Svelte arrays and objects to trigger reactivity?
This tests knowledge of Svelte 5 deep reactivity: $state wraps arrays in proxies so push and property mutations trigger updates. Mention $state first, then note legacy syntax needs reassignment. A red flag is claiming push never works in Svelte.
This question tests whether you know Svelte 5's $state rune enables deep reactivity through proxies, which means array methods like push and direct property mutations automatically trigger updates. A strong answer leads with declaring the state via $state so the array or object becomes a reactive proxy, then correctly notes that in legacy Svelte without runes you must force reassignment. A red flag is insisting push never works or treating spread syntax and reassignment hacks as the only correct pattern.
Read the original → svelte.dev
- #svelte
- #reactivity
- #runes
- #javascript
- #frontend
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