The useEffect Dependency Array: Every Rule and Why It Exists

Q: What is "The useEffect Dependency Array: Every Rule and Why It Exists" about?

The dependency array is a correctness contract, not a performance optimization. Every value the effect reads must be in it. Here is what breaks when that contract is violated.

Q: What topics does "The useEffect Dependency Array: Every Rule and Why It Exists" cover?

This article covers: useeffect dependency array, react exhaustive deps, useeffect deps rules, react hooks linter, useeffect missing dependency, react effect dependencies.

The dependency array is not a performance optimization — it is a correctness contract. Every value the effect reads from the component scope must be in it. Here is what breaks when that contract is violated and how the linter enforces it.

June 7, 20261 min read2 / 3

Coming soon.

Practice what you just read.

Advanced Dependency Array

1 exercise

Keep reading

Why React Hooks Exist: The Problem They Were Built to Solve

3 min read

useState Under the Hood: How React Stores State in a Linked List

4 min read

Stale Closures in React: Why useState Gives You the Wrong Value

1 min read

PrevioususeEffect Is Not a Lifecycle Hook: The Synchronization Model Next useEffect Cleanup and Race Conditions: Why Your Fetch Is Broken