Q1. Explain SSR, SSG, ISR and CSR in Next.js.
These describe when HTML is produced. CSR ships a minimal shell plus a JS bundle; the browser fetches data and renders, so first paint is slower and SEO weaker, but navig...
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Q2. What are the possible ways to create objects in JavaScript?
There are many ways to create objects in javascript as mentioned below: 1. **Object literal syntax:** The object literal syntax (or object initializer), is a comma-separa...
Q3. What are the main differences between the App Router and the Pages Router?
The Pages Router uses files under pages/. Each file exports a default component, data comes from getStaticProps, getServerSideProps or getStaticPaths, and _app and _docum...
Q4. What is a prototype chain?
The prototype chain is a core concept in JavaScript’s inheritance model. It allows objects to inherit properties and methods from other objects. When you try to access a ...
Q5. What is the difference between Server Components and Client Components?
In the App Router components are Server Components by default. They run only on the server, can be async, can read databases or secrets directly, and send no JavaScript t...
Q6. How do Observables differ from Promises, and how do you avoid subscription leaks?
A Promise represents a single future value and is eager: it starts when created, cannot be cancelled, and has no operators beyond then and catch. An Observable is lazy, e...
Q7. What is the Difference Between call, apply, and bind?
In JavaScript, `call`, `apply`, and `bind` are methods that allow you to control the context (`this` value) in which a function is executed. While their purposes are simi...
Q8. What is JSX?
_JSX_ stands for _JavaScript XML_ and it is an XML-like syntax extension to ECMAScript. Basically it just provides the syntactic sugar for the `React.createElement(type, ...
Q9. How does data fetching and caching work in the App Router?
You fetch inside async Server Components using the extended fetch: ```ts const res = await fetch('https://api.example.com/posts', { next: { revalidate: 60, tags: ['posts'...
Q10. What is JSON and its common operations?
**JSON (JavaScript Object Notation)** is a lightweight, text-based data format that uses JavaScript object syntax for structuring data. It was popularized by Douglas Croc...