Practice with our comprehensive collection of React interview questions. From fundamentals to advanced patterns, we've got you covered.
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Component Reusability Build self-contained UI pieces you can assemble like Lego blocks. Reduces duplication of code and speeds up development across l...
Improve Performance ⚡ Keys allow React to diff* elements faster by comparing keys between old and new virtual DOM trees. Without keys, React re-render...
The React Hook cannot be considered as a replacement for Redux (It is an open-source, JavaScript library useful in managing the application state) whe...
React Hooks will avoid a lot of overheads such as the instance creation, binding of events, etc., that are present with classes. Hooks in React will r...
There are two types of Hooks in React. They are:
Static typing refers to the process of code check during the time of compilation for ensuring all variables will be statically typed. React Hooks are ...
Parent Component to Child Component (using props) With the help of props, we can send data from a parent to a child component. How do we do this? Cons...
Stateful Value & Setter When you call const [value, setValue] = useState(initial), React keeps track of value across renders. Calling setValue(newValu...
State‐Driven View Selection 🎛️ The component holds a piece of state (e.g. activePage) that indicates which child component to show. Updating that sta...
Stateful Logic in Functions 🧠 Hooks like useState and useReducer allow you to manage component state directly in functions. No need for this.state or...
Keep Values Between Renders ⏳ Sometimes you need to remember a value (like a timer ID or previous prop) but don’t want the component to update its UI ...
Encapsulate Logic 🧩 Move related Hook calls (state, effects, context) into one function. Keeps components clean by extracting complex or repetitive l...