BED AY25S2 Formative: npm, http routes

Which line of code correctly initializes an Express application instance?

• const app = new express();
• const app = express.create();

• const app = express.init();
• const app = express()

Which code is used to create a route that handles an HTTP POST request to the path /users?

• app.get('/users',
  (req, res) => {...})

• app.put('/users',
  (req, res) => {...})

• app.delete('/users',
  (req, res) => {...})

• app.post('/users',
  (req, res) => {...})

In the route /items/:id, how do you access the value of the dynamic route :id?

• req.body.id
• req.params.id
• req.query.id
• req.headers.id

For the request /users?status=active,
how do you access the value of the query parameter?

• req.params.status

• req.query.status

• req.body.status

• req.url.status

Which method starts the Express server and binds it to a specified port?

• app.start()
• server.run()
• app.listen()
• express.init()

Which npm command installs the express package
and adds it as a production dependency to package.json?

• npm add express

• npm install --save express

• npm get express

• npm install express

To execute a custom script named "deploy" in your package.json, which npm command must you use?

• npm run deploy
• npm start deploy
• npm exec deploy
• npm deploy

What is arr3?
const arr1 = [1, 2]
const arr2 = [3, 4]
const arr3 = [...arr1, ...arr2];

• [1, 3, 4]
• [2, 3, 4]
• [1, 2, 3, 4]
• [1, 2, 4]

What is filtered?
const numbers = [1, 2, 3, 4, 5];
const filtered = numbers.filter(num => num <= 1)

• [1]
• [4, 5]
• [2, 3]
• []

What is the purpose of wrapping code in a try-catch block in Express?

• To improve code readability and maintainability.
• To increase the performance of the application.
• To automatically log all requests made to the server.
• To handle errors gracefully and prevent application crashes.