Forgetting to remove event listeners on unmount
Forgetting to Remove Event Listeners on Unmount in React A common memory leak issue in React occurs when event listeners aren’t properly cleaned up when components unmount. This can lead….
Tag: react lifecycle
Not using shouldComponentUpdate in class components
Not using shouldComponentUpdate in class components is a common mistake in React class-based components, especially when performance optimization is needed. The shouldComponentUpdate lifecycle method is used to prevent unnecessary re-renders….
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….
Using outdated React syntax or deprecated methods
Modern React Syntax and Avoiding Deprecated Methods React has evolved significantly over the years, and using outdated syntax or deprecated methods can lead to maintainability issues, performance problems, and even….
Causing memory leaks with uncleaned subscriptions
Preventing Memory Leaks in React with Proper Cleanup Memory leaks in React applications often occur when components don’t properly clean up subscriptions, event listeners, or asynchronous operations before unmounting. Here’s….
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….
Using hooks in class components
Using Hooks in Class Components: Understanding the Limitations and Alternatives React Hooks are a powerful feature introduced in React 16.8, but they come with an important restriction: hooks only work….
Using setState in render() causing infinite re-render
Avoiding Infinite Re-renders from setState in render() Calling setState within the render() method (or directly in the function component body) creates an infinite loop because: The Problem Code Correct Solutions….
Directly modifying state – Do not mutate state directly. Use setState()
Understanding State Immutability in React Why You Shouldn’t Mutate State Directly In React, you should never modify state directly because: Bad Practice: Direct Mutation Good Practice: Using setState() For Functional….
useLayoutEffect vs. useEffect – When to Use Each
Understanding the differences between these two hooks is crucial for optimizing performance and avoiding visual glitches in React applications. Key Differences Feature useEffect useLayoutEffect Timing After browser paint Before browser….