Transport & Patterns

Preview — 3 of 10 questions

Which factory method bootstraps a standalone NestJS microservice (no HTTP server)?

javascript

import { NestFactory } from '@nestjs/core';
import { Transport, MicroserviceOptions } from '@nestjs/microservices';
import { AppModule } from './app.module';

async function bootstrap() {
  const app = await NestFactory.createMicroservice<MicroserviceOptions>(AppModule, {
    transport: Transport.TCP,
    options: { host: '0.0.0.0', port: 3001 },
  });
  await app.listen();
}
bootstrap();

ANestFactory.createMicroservice()

BNestFactory.create()

CNestFactory.createApplicationContext()

DMicroserviceFactory.start()

Which of the following is NOT a built-in value of the Transport enum?

javascript

import { Transport } from '@nestjs/microservices';

Transport.TCP;
Transport.REDIS;
Transport.NATS;
Transport.RMQ;
Transport.KAFKA;
Transport.GRPC;
// Transport.GRAPHQL  // ❌ does not exist

ATransport.TCP

BTransport.KAFKA

CTransport.GRAPHQL

DTransport.RMQ

Which decorator handles a request-response message and returns a value to the caller?

javascript

import { Controller } from '@nestjs/common';
import { MessagePattern, Payload } from '@nestjs/microservices';

@Controller()
export class MathController {
  @MessagePattern({ cmd: 'sum' })
  sum(@Payload() nums: number[]): number {
    return nums.reduce((a, b) => a + b, 0); // returned to caller
  }
}

A@MessagePattern()

B@EventPattern()

C@Get()

D@Subscribe()

Answer all 10 questions (7 more), see explanations for every answer, and track your score.