Forgetting to remove timers (setInterval) on unmount
Forgetting to Remove Timers on Unmount in React The Memory Leak Problem A common React mistake is creating timers with setInterval but forgetting to clean them up when components unmount:….
Month: March 2025
Using deprecated lifecycle methods like componentWillMount
Using Deprecated React Lifecycle Methods The Problem with Legacy Lifecycle Methods React has deprecated several class component lifecycle methods, including: These were replaced because: Why You Should Stop Using componentWillMount….
Ignoring React warnings in console, leading to bigger issues later
Why You Should Never Ignore React Warnings React’s console warnings exist to prevent: Common Warnings Developers Ignore (But Shouldn’t) 1. “Missing dependency” Warnings Risk: Stale closures that use outdated prop/state….
Using document.querySelector instead of useRef in React
Why This Is Problematic Using document.querySelector in React components is generally considered an anti-pattern because: When useRef Is the Better Choice Proper Ref Usage Patterns When You Might Still Need….
Forgetting to update component keys when state changes
The Problem A common React anti-pattern is failing to update key props when the underlying data changes, which can lead to: Common Scenarios Where This Occurs The Solution When to….
Using key props incorrectly in .map() lists
When rendering lists in React using .map(), using keys incorrectly is a common mistake that can lead to performance issues and bugs. Here’s what you need to know: The Right….
Setting state inside an async function without using functional updates
Setting state inside an async function without using functional updates can lead to stale state issues because the state may not reflect the latest updates when the async operation completes…..
Using non-serializable values in Redux store
Using non-serializable values in the Redux store can lead to unexpected behavior, especially when using middleware like redux-persist or tools like Redux DevTools, which rely on serialization for state tracking….
Trying to run React app without running npm install first
Running a React app without executing npm install first will likely result in errors because the app depends on external libraries listed in package.json. These libraries are installed in the….
Incorrect file structure in public/ directory causing broken assets
It sounds like you’re dealing with an issue where the file structure in the public/ directory is causing broken assets in your project. This often happens in web development when….