Forgetting to remove timers (setInterval) on unmount
Forgetting to clear timers (like setInterval) when a component unmounts is a common source of memory leaks in React applications. Here’s how to properly handle timers to avoid these issues:….
Category: ReactJS
Using deprecated lifecycle methods like componentWillMount
Handling Deprecated React Lifecycle Methods React has deprecated several legacy lifecycle methods (like componentWillMount, componentWillReceiveProps, and componentWillUpdate) in favor of more modern alternatives. Here’s how to migrate away from these….
Ignoring React warnings in console, leading to bigger issues later
React’s console warnings exist for important reasons – they often signal potential bugs or performance issues that will cause problems down the line. Here’s why you should never ignore them….
Using document.querySelector instead of useRef in React
Why document.querySelector is Problematic in React (and What to Use Instead) Using document.querySelector in React components is generally an anti-pattern that can lead to several issues. Here’s why you should….
Forgetting to update component keys when state changes
A common React pitfall is not updating key props when your component’s underlying data changes, which can lead to subtle bugs and performance issues. The Problem When state changes but….
Using key props incorrectly in .map() lists
Using key props incorrectly in .map() operations is one of the most frequent React anti-patterns. Here’s what you need to know to fix these issues: The Right Way to Use….
Setting state inside an async function without using functional updates
When working with React state in asynchronous operations, you need to be careful about stale closures and race conditions. Here are several approaches to safely set state without using functional….
Using non-serializable values in Redux store
Handling Non-Serializable Values in Redux Store Using non-serializable values in your Redux store is generally discouraged, but there are cases where you might need to store non-serializable data. Here’s how….
Trying to run React app without running npm install first
Running a React App Without npm install You’re trying to run a React application without first installing its dependencies with npm install. This won’t work because: Why You Need npm….
Incorrect file structure in public/ directory causing broken assets
When assets (CSS, JS, images) are broken due to incorrect file structure in your public/ directory, here’s how to diagnose and fix the issues: Common Problems and Solutions Recommended Directory….