Using hooks inside class components
In React, using hooks inside class components is not allowed because hooks are designed exclusively for functional components. If you attempt to use hooks inside a class component, React will….
Tag: useEffect
Calling hooks conditionally or inside loops
The Rules of Hooks: Avoiding Conditional and Looped Calls React Hooks have strict rules about where and how they can be called. Violating these rules leads to bugs and unpredictable….
Listening to window events without cleaning them up
Handling Window Events Properly in React A common source of memory leaks in React applications comes from adding window event listeners without properly removing them when components unmount. Here’s how….
Infinite re-renders due to improper dependency handling in useEffect
In React, the useEffect hook allows you to perform side effects (e.g., data fetching, subscriptions, timers) in function components. One common problem developers face when using useEffect is infinite re-renders,….
Calling API in render() causing unnecessary requests
In React, you should avoid making API calls directly inside the render() method (or inside a component’s return statement). Calling an API in render() will result in unnecessary and repeated….
Forgetting to abort API requests on unmount
In React, when you make asynchronous operations like API requests inside a component (using fetch, axios, or other libraries), it’s important to clean up those operations when the component unmounts…..
Using async functions inside useEffect incorrectly
Proper Usage of Async Functions in useEffect A common React mistake is improperly handling async functions inside useEffect, which can lead to memory leaks, race conditions, and unexpected behavior. Here’s….
Updating state after component unmounts – Can’t perform a React state update on an unmounted component
When you try to update the state of a React component after it has unmounted, you’ll encounter the error: “Can’t perform a React state update on an unmounted component.” This….
Using useEffect without dependencies causing infinite requests
In React, the useEffect hook is a powerful way to perform side effects in functional components (like fetching data, subscribing to events, or manually updating the DOM). However, using useEffect….
Accessing stale state inside useEffect
When working with React’s useEffect hook, it’s important to be aware that state updates are asynchronous. This means that if you directly reference state values inside a useEffect hook, you….