Passing new object references in props every render
In React, passing new object references in props on every render can lead to unnecessary re-renders of child components, even if the actual data inside the objects hasn’t changed. This….
Tag: react best practices
Not memoizing expensive computations using useMemo
In React, expensive computations (such as complex calculations or large data processing) can slow down the app, especially when they are recalculated on every render. To optimize performance, React provides….
Using inline functions causing unnecessary renders
Optimizing Performance by Avoiding Unnecessary Renders from Inline Functions Inline functions in React components can lead to performance issues by causing unnecessary re-renders of child components. Here’s a deep dive….
Re-rendering entire component tree unnecessarily
Unnecessary re-renders in React occur when the component tree re-renders more often than needed, affecting performance. This can lead to slower UI updates, especially in large applications, as React may….
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,….
Using API data before it is fetched
When working with APIs in React, it’s important to ensure that data is available before trying to access it. Attempting to use API data before it has been successfully fetched….
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….