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Learn how Svelte's reactive statements automatically update derived values when dependencies change, with a simple counter example, a derived array example, limits, and common pitfalls.
When a Svelte component’s <code>$:</code> block runs too often, performance suffers. Derived stores offer memoized, source‑driven recomputation. This blog contrasts reactive statements and derived stores, shows a counter example, and gives a clear checklist for choosing the right tool.
javascript
svelte