Using useRef to store values but expecting re-renders
A common misconception in React is expecting components to re-render when values stored in useRef change. This misunderstanding can lead to bugs where UI doesn’t update as expected. The Core….
Tag: Functional components
Calling useContext outside of a <Context.Provider>
A common React mistake occurs when trying to use useContext to access a context value that hasn’t been provided by a matching <Context.Provider> in the component tree. The Core Problem….
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:….
Forgetting default state values in functional components
Forgetting to set default state values in functional components can lead to unexpected behavior, runtime errors, or undefined values in your React app. This issue often occurs when using the….
Forgetting to use React Fragments (<>…)
The Importance of React Fragments and How to Use Them Properly A common mistake in React development is forgetting to use Fragments when returning multiple elements, which leads to unnecessary….
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:….
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 useState but forgetting to initialize it with a default value
Forgetting to Initialize useState with a Default Value A common React mistake is declaring state with useState but forgetting to provide an initial value, which can lead to undefined errors….
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….
Using arrow functions inside JSX without memoization leading to re-renders
Arrow Functions in JSX Without Memoization A common React performance pitfall is using inline arrow functions in JSX without proper memoization, which can cause unnecessary re-renders of child components. The….