REACT INTERVIEW MASTER
React Interview Master Guide
Mastering React interviews requires both conceptual understanding + hands-on coding skills. Here’s a focused guide to help you prepare effectively.
🧠 1. Core React Concepts
❓ What is React?
A JavaScript library for building user interfaces, especially single-page applications (SPAs).
❓ What is JSX?
JavaScript + HTML syntax used in React.
const element = <h1>Hello</h1>;
❓ What are Components?
Reusable UI building blocks.
Functional Components
Class Components
⚙️ 2. Props vs State
Props State
Passed from parent Managed inside component
Immutable Mutable
Used for communication Used for data
🔄 3. React Hooks (Very Important)
useState
const [count, setCount] = useState(0);
useEffect
useEffect(() => {
console.log("Component mounted");
}, []);
Other Hooks
useContext
useRef
useMemo
⚡ 4. Virtual DOM
React uses a Virtual DOM to improve performance by updating only changed elements instead of reloading the whole page.
🔁 5. Lifecycle (Class vs Hooks)
Class:
componentDidMount
componentDidUpdate
Hooks:
useEffect handles lifecycle
📡 6. Handling Events
<button onClick={() => alert("Clicked")}>Click</button>
🔐 7. Conditional Rendering
{isLoggedIn ? <Dashboard /> : <Login />}
React Interview Master Guide
Mastering React interviews requires both conceptual understanding + hands-on coding skills. Here’s a focused guide to help you prepare effectively.
🧠 1. Core React Concepts
❓ What is React?
A JavaScript library for building user interfaces, especially single-page applications (SPAs).
❓ What is JSX?
JavaScript + HTML syntax used in React.
const element = <h1>Hello</h1>;
❓ What are Components?
Reusable UI building blocks.
Functional Components
Class Components
⚙️ 2. Props vs State
Props State
Passed from parent Managed inside component
Immutable Mutable
Used for communication Used for data
🔄 3. React Hooks (Very Important)
useState
const [count, setCount] = useState(0);
useEffect
useEffect(() => {
console.log("Component mounted");
}, []);
Other Hooks
useContext
useRef
useMemo
⚡ 4. Virtual DOM
React uses a Virtual DOM to improve performance by updating only changed elements instead of reloading the whole page.
🔁 5. Lifecycle (Class vs Hooks)
Class:
componentDidMount
componentDidUpdate
Hooks:
useEffect handles lifecycle
📡 6. Handling Events
<button onClick={() => alert("Clicked")}>Click</button>
🔐 7. Conditional Rendering
{isLoggedIn ? <Dashboard /> : <Login />}
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