---
title: "advanced use latest"
description: "Access latest values in callbacks without adding them to dependency arrays. Prevents effect re-runs while avoiding stale closures."
type: skill
canonical_url: https://claudary.paisolsolutions.com/skills/advanced-use-latest
source: "Claudary"
difficulty: intermediate
author: "Claude Code Knowledge Pack"
date: 2026-07-10T10:59:19.916Z
license: CC-BY-4.0
attribution: "advanced use latest — Claudary (https://claudary.paisolsolutions.com/skills/advanced-use-latest)"
---

# advanced use latest
Access latest values in callbacks without adding them to dependency arrays. Prevents effect re-runs while avoiding stale closures.

## Overview

---
title: useEffectEvent for Stable Callback Refs
impact: LOW
impactDescription: prevents effect re-runs
tags: advanced, hooks, useEffectEvent, refs, optimization
---

## useEffectEvent for Stable Callback Refs

Access latest values in callbacks without adding them to dependency arrays. Prevents effect re-runs while avoiding stale closures.

**Incorrect (effect re-runs on every callback change):**

```tsx
function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
  const [query, setQuery] = useState('')

  useEffect(() => {
    const timeout = setTimeout(() => onSearch(query), 300)
    return () => clearTimeout(timeout)
  }, [query, onSearch])
}
```

**Correct (using React's useEffectEvent):**

```tsx
import { useEffectEvent } from 'react';

function SearchInput({ onSearch }: { onSearch: (q: string) => void }) {
  const [query, setQuery] = useState('')
  const onSearchEvent = useEffectEvent(onSearch)

  useEffect(() => {
    const timeout = setTimeout(() => onSearchEvent(query), 300)
    return () => clearTimeout(timeout)
  }, [query])
}
```

---

Source: [Claudary](https://claudary.paisolsolutions.com/skills/advanced-use-latest) · https://claudary.paisolsolutions.com