Calling setState() with a function but not using previous state
Calling setState() with a function but not using the previous state in React can lead to inconsistent or incorrect UI updates, especially when the new state depends on the current….
Tag: Functional Updates
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….
Calling setState() with a function but not using previous state
A common React anti-pattern is using the functional form of setState() (or state setters in hooks) without actually utilizing the previous state parameter. This unnecessarily complicates code and can sometimes….
Accessing stale state inside useEffect
When working with React’s useEffect hook, it’s important to be aware that state updates are asynchronous. This means that if you directly reference state values inside a useEffect hook, you….
Updating State Based on Previous State
In React, when you’re updating the state using the useState hook, sometimes you need to modify the current state based on its previous value. React provides a convenient way to….