Q11. How do CommonJS and ES modules differ?
CommonJS is Node's original system: require() is a function executed at runtime, module.exports is a mutable object, resolution can be dynamic and conditional, and module...
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Q12. How do dynamic routes and generateStaticParams work?
Dynamic segments use bracket folders: app/blog/[slug]/page.tsx receives params as a prop, which is a Promise in recent versions. Catch-all routes use [...slug] and option...
Q13. What is the purpose of the array slice method?
The `slice()` method in JavaScript is used to extract a section of an array, returning a new array containing the selected elements. It does not modify the original array...
Q14. What are Route Handlers and how do they differ from API Routes?
Route Handlers live in app/api/.../route.ts and export HTTP-method functions such as GET, POST, PUT, DELETE and PATCH. They receive a standard Request and return a Respon...
Q15. What is the purpose of the array splice method?
The `splice()` method in JavaScript is used to add, remove, or replace elements within an array. Unlike `slice()`, which creates a shallow copy and does not alter the ori...
Q16. How do you handle metadata and SEO in the App Router?
You export a static metadata object or a generateMetadata async function from a layout or page. It can set title, description, canonical URL, Open Graph, Twitter cards an...
Q17. What is the difference between slice and splice?
Here are the key differences between `slice()` and `splice()` methods in JavaScript arrays: | `slice()` | `splice()` | | -------------------------------------------------...
Q18. What is Next.js middleware and when should you use it?
Middleware in middleware.ts at the project root runs before a request is completed, on the Edge runtime, and can rewrite, redirect, set headers or return a response direc...
Q19. How do you compare Object and Map?
**Objects** and **Maps** both allow you to associate keys with values, retrieve those values, delete keys, and check if a key exists. Historically, Objects have been used...
Q20. How do the different Next.js caches and revalidation layers work?
Next.js has several cache layers. The Data Cache stores individual fetch results and can be tagged. The Full Route Cache stores rendered HTML and RSC payloads for static ...