What is the closure function in Javascrpt(javascrpt)

JavaScript Closures Quiz

JavaScript Closures Quiz

1. What will be the output of the following code?

function outerFunction() {
    let outerVar = "I am from the outer function";

    function innerFunction() {
        console.log(outerVar);
    }

    return innerFunction;
}

const closureExample = outerFunction();
closureExample();



2. What is a closure in JavaScript?




3. Which of the following is an advantage of using closures in JavaScript?




Comments

Post a Comment

Popular posts from this blog

React Interview Questions - Controlled vs Uncontrolled

React Interview Questions - Controlled vs Uncontrolled React Interview Questions Controlled vs Uncontrolled Components in React 1. What is a Controlled Component in React? A controlled component is a form element whose value is controlled by React state. Example: const [name,setName] = useState(""); <input value={name} onChange={(e)=>setName(e.target.value)} /> 2. What is an Uncontrolled Component in React? An uncontrolled component stores form data in the DOM instead of React state. Example: const inputRef = useRef(); <input ref={inputRef} /> 3. What is the difference between Controlled and Uncontrolled components? Controlled components use React state while uncontrolled components use DOM references. Controlled components are easier for validation and form handling. 4. When should you use Controlled Components? Use controlled components when you need validation, dynamic UI updates, or form control logic. 5. When...
Read more

gg

Understanding React Auth & Hooks 🛠 React: useState vs useRef vs useMemo + Login Explained 1️⃣ useState vs useRef useState is for updating and re-rendering the component. useRef stores a value across renders without causing a re-render. const [count, setCount] = useState(0); const countRef = useRef(0); 2️⃣ useRef vs useMemo useRef stores values or DOM nodes. useMemo is for performance, caching results of calculations. const value = useMemo(() => expensiveCalc(num), [num]); 3️⃣ How Login Works in React User fills login form React sends data to backend Backend validates and sends token React stores token Future requests include token 4️⃣ Where Token is Stored Tokens are stored in: localStorage sessionStorage Cookies (more secure) 5️⃣ Who Generates the Token? The backend (e.g. Express, Django) generates the token and returns it to React. React stores and uses it for authentication.
Read more