What are the most dangerous mistakes when working with hooks?

The most dangerous mistakes when working with React hooks:

• Breaking the rules of hooks: calling hooks outside the top level of a component or inside conditional statements leads to unpredictable behavior.

• useEffect dependencies: incorrectly specifying dependencies in the array causes unnecessary or missing effect calls.

• Using outdated values in closures: if dependencies are not updated in callbacks or effects, you may work with "frozen" state values.

• Overusing hooks: for example, using too many useState instead of consolidating state, which complicates logic.

• Potential memory leaks: uncleaned effects (e.g., subscriptions) can lead to leaks.

Example of an error with useEffect:

useEffect(() => {
  fetchData();
}, []); // if fetchData depends on props or state, this might be an error

Correctly — specify all dependencies so that the effect updates properly.