Q51. What is the Temporal Dead Zone?
The **Temporal Dead Zone (TDZ)** refers to the period between the start of a block and the point where a variable declared with `let` or `const` is initialized. During th...
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Q52. What is the difference between createElement and cloneElement?
Both `React.createElement` and `React.cloneElement` are used to work with React elements, but they serve different purposes. #### **createElement:** Creates a new React e...
Q53. How do you set head metadata per-route with `head.js` / `head.tsx`?
In the App Router you can create a `head.js` or `head.tsx` file inside a route segment to return `` elements (title, meta, link) for that segment. This is preferred for c...
Q54. What is an IIFE (Immediately Invoked Function Expression)?
IIFE (Immediately Invoked Function Expression) is a JavaScript function that runs as soon as it is defined. The signature of it would be as below, ```javascript (function...
Q55. What is the useRouter hook in Next.js?
A hook that allows access to the router object and perform navigation. The `useRouter` hook allows you to programmatically change routes inside **client** components.
Q56. How do you decode or encode a URL in JavaScript?
`encodeURI()` function is used to encode an URL. This function requires a URL string as a parameter and return that encoded string. `decodeURI()` function is used to deco...
Q57. What is the difference between push and replace in useRouter?
The `push` method adds a new entry to the browser's history stack, while `replace` replaces the current entry in the history stack. ```jsx const router = useRouter(); // ...
Q58. What is memoization?
Memoization is a functional programming technique which attempts to increase a function’s performance by caching its previously computed results. Each time a memoized fun...
Q59. What is children prop?
The `children` prop is a special prop in React used to pass elements between the opening and closing tags of a component. It is commonly used in layout and wrapper compon...
Q60. How do you navigate programmatically in Next.js?
Using useRouter() hook. ```jsx const router = useRouter(); function handleClick() { router.push(`/path`); } Go There; jsx router.push(href: string, { scroll: boolean }) `...