Q41. What are the benefits of pure functions?
Some of the major benefits of pure functions are listed below, - **Easier testing:** Since output depends only on input, pure functions are simple to test. - **Predictabi...
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Q42. What is the Link component in Next.js?
A component for client side navigation between pages. ```jsx import Link from "next/link"; Home About ```
Q43. What is the purpose of the let keyword?
The `let` keyword in JavaScript is used to declare a **block-scoped local variable**. This means that variables declared with `let` are only accessible within the block, ...
Q44. What is the `metadata` export in the App Router and how do you use it?
The App Router supports a `metadata` export (or `metadata.js/ts`) to define route-level metadata like title, description, open graph tags and robots. You can export a sta...
Q45. What is the difference between let and var?
You can list out the differences in a tabular format | var | let | | -------------------------------------------------------------- | ------------------------------------...
Q46. What is `generateStaticParams` and when should you use it?
`generateStaticParams` is used in the App Router to statically generate dynamic routes at build time (SSG). Return an array of param objects for routes like `[slug]` so N...
Q47. What is the reason to choose the name let as a keyword?
The keyword `let` was chosen because it originates from mathematical notation, where "let" is used to introduce new variables (for example, "let x = 5"). This term was ad...
Q48. How do fetch cache options work in the App Router?
The `fetch` API in server components supports caching controls via `{ next: { revalidate } }` and cache modes like `cache: 'no-store'` or `cache: 'force-cache'`. Use `no-...
Q49. How do you redeclare variables in a switch block without an error?
When you try to redeclare variables using `let` or `const` in multiple `case` clauses of a `switch` statement, you will get a SyntaxError. This happens because, in JavaSc...
Q50. What does the `dynamic` export do in the App Router?
Exporting `dynamic` controls how a route is rendered: `'force-dynamic'`, `'force-static'`, or `'auto'`. Use it to override Next.js detection — for example, force dynamic ...