Introduction to NestJS

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Questions and Answers

NestJS builds upon which of the following core principles to create maintainable applications?

Exclusively using Reactive Programming to handle asynchronous data streams.
A combination of OOP, FP, and FRP (Functional Reactive Programming). (correct)
Primarily relying on imperative programming techniques for direct control over application state.
Strict adherence to Functional Programming (FP) paradigms, avoiding Object-Oriented Programming (OOP).

What benefit does NestJS provide over plain Node.js frameworks like Express or Fastify?

NestJS provides a higher level of abstraction and an out-of-the-box application architecture. (correct)
NestJS eliminates the capacity to use third-party modules, streamlining development.
NestJS increases server response time by automatically optimizing database queries.
NestJS only supports TypeScript, ensuring code is strictly typed.

Which command is used to create a new NestJS project using the Nest CLI?

`nest create project-name`
`nest new project-name` (correct)
`nest init project-name`
`nest start project-name`

What is the primary purpose of NestJS Modules?

To encapsulate and organize related components, providers, and controllers into cohesive units. (D) Signup and view all the answers

In NestJS, what is the role of Providers?

To encapsulate reusable logic that can be injected into controllers, services, or other providers. (D) Signup and view all the answers

Which of the following is a key advantage of using TypeScript with NestJS?

Strong typing helps catch errors during development, improves code maintainability, and enhances developer productivity. (A) Signup and view all the answers

What purpose do Pipes serve in NestJS?

They transform and validate request data, ensuring it meets the required format and criteria. (D) Signup and view all the answers

How does NestJS handle unhandled exceptions and errors within an application?

NestJS uses Exception Filters to catch and process exceptions, allowing for centralized error handling and custom responses. (D) Signup and view all the answers

What is the main function of Guards in NestJS?

To protect routes from unauthorized access by verifying user roles and permissions. (A) Signup and view all the answers

What is achieved by utilizing Interceptors in NestJS?

Intercepting and modifying the request or response stream, allowing for custom logic like logging, caching, or transforming data. (A) Signup and view all the answers

When should Dynamic Modules be used in NestJS?

When a module needs to be configured and customized at runtime based on environment variables or other dynamic factors. (B) Signup and view all the answers

What is the purpose of the Execution Context in NestJS?

To provide access to the underlying platform's request and response objects, along with metadata about the current execution process. (D) Signup and view all the answers

In NestJS, what does Platform Agnosticism refer to?

The design principle that allows NestJS to work with different HTTP server frameworks (like Express or Fastify) and other platforms. (D) Signup and view all the answers

How do you configure CORS (Cross-Origin Resource Sharing) in a NestJS application?

By using the built-in <code>CORS</code> middleware, configuring allowed origins, methods, and headers. (B) Signup and view all the answers

What is the purpose of Helmet in a NestJS application?

To secure the application by setting various HTTP headers, protecting against common web vulnerabilities. (C) Signup and view all the answers

What role do interceptors play in the context of WebSockets within NestJS?

They allow you to intercept and modify incoming and outgoing WebSocket messages, similar to their role in HTTP request handling. (B) Signup and view all the answers

In NestJS Microservices, what is the primary function of a 'transporter'?

To facilitate communication between microservices using different protocols (e.g., Redis, MQTT, RabbitMQ). (B) Signup and view all the answers

What is the purpose of the NestJS CLI?

To provide a set of tools for scaffolding, developing, and maintaining NestJS applications, such as generating modules, controllers, and services. (B) Signup and view all the answers

What is the primary advantage of using the SWC compiler with NestJS?

SWC offers significantly faster compilation speeds compared to the standard TypeScript compiler, improving developer productivity. (D) Signup and view all the answers

What is the purpose of the `RouterModule` in NestJS?

To organize routes into separate modules, enabling a more modular and scalable application structure. (B) Signup and view all the answers

Flashcards

NestJS

A framework for building efficient, scalable Node.js server-side applications.

NestJS Key Features

Progressive JavaScript, TypeScript support, OOP, FP, and FRP.