Using hooks inside class components
React Hooks were designed specifically for function components and cannot be used directly inside class components. This is a fundamental constraint of React’s architecture. Here’s what you need to know:….
Tag: react lifecycle
Not using useCallback when passing event handlers to child components
The Importance of useCallback for Event Handlers in Child Components When passing event handlers to child components in React, failing to use useCallback can lead to performance issues. Here’s what….
Listening to window events without cleaning them up
A particularly insidious type of memory leak occurs when you add event listeners to the window object but fail to remove them when your React component unmounts. Here’s what you….
Forgetting to remove event listeners on unmount
A common memory leak issue in React occurs when event listeners aren’t properly removed when components unmount. Here’s how to handle this correctly: The Problem When you add event listeners….
Setting state inside render() leading to infinite loop
Avoiding Infinite Loops from State Updates in Render A critical React mistake is calling state update functions (like setState or state setters from useState) inside the render() method or function….
Accessing state before super(props) in a class component
Understanding super(props) and State Initialization in Class Components A common React anti-pattern is trying to access this.state before calling super(props) in a class component constructor. Here’s what you need to….
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….
Using useReducer but forgetting to return a new state in the reducer function
Forgetting to Return New State in useReducer A common mistake when using useReducer is mutating the existing state or forgetting to return a new state object from the reducer function,….
Accessing state immediately after setState() before it updates
A common React pitfall is trying to access an updated state value immediately after calling setState or the state setter from useState. This doesn’t work because state updates are asynchronous….
Using hooks inside class components
A fundamental limitation of React is that hooks cannot be used inside class components. This is a deliberate design choice by the React team, as hooks were created specifically for….