Rahul Vijayan
Follow for more updates
TCS Wings 1 T1 MERN - Set 7
- Mason wants to handle asynchronous errors in his Express routes without using
try-catchblocks in every route. Which helper function pattern can streamline this process?
- a) Middleware chaining
- b) Wrapper function that returns a promise
- c) Logging middleware
- d) Error-handler in route itself
Answer: b) Wrapper function that returns a promise
- Harper is using MongoDB's
$aggregateto calculate the total number of items in each category. Which stage allows her to group data by a category field?
- a)
$match - b)
$project - c)
$group - d)
$sort
Answer: c) $group
- Noah is using
axiosto fetch data in his React component and notices aCORSerror in the console. What should he configure in the Express server to resolve this?
- a) Enable
body-parser - b) Use the
corsmiddleware - c) Use the
helmetpackage - d) Change the HTTP method
Answer: b) Use the cors middleware
- Grace wants her React component to run a specific function only when a dependency array value changes. Which hook will help her achieve this?
- a)
useState - b)
useEffect - c)
useMemo - d)
useCallback
Answer: b) useEffect
- Oliver is updating a document in MongoDB and wants only one field to be modified while leaving the rest unchanged. Which MongoDB operator should he use?
- a)
$set - b)
$push - c)
$pull - d)
$unset
Answer: a) $set
- Ella wants her React component to store some data that should only reset when the component unmounts. Which React feature will help her achieve this?
- a)
useState - b)
useEffect - c)
useRef - d)
useContext
Answer: c) useRef
- Ava wants to ensure a middleware runs on every request to her Express server. Where should she place this middleware in her server configuration?
- a) Before all route definitions
- b) After all route definitions
- c) Inside each route handler
- d) Inside
app.listen
Answer: a) Before all route definitions
- Lucas is developing a CRUD API using Express and MongoDB. Which HTTP method is used to delete a specific document based on an ID in a RESTful API?
- a) POST
- b) PUT
- c) DELETE
- d) GET
Answer: c) DELETE
- Amelia is using MongoDB and wants to delete multiple documents that match a specific criterion. Which method should she use?
- a)
delete - b)
deleteOne - c)
deleteMany - d)
remove
Answer: c) deleteMany
- Ethan is setting up an API in Express that requires authentication. Which HTTP status code should he return if the user provides invalid credentials?
- a) 200
- b) 403
- c) 401
- d) 404
Answer: c) 401
No comments:
Post a Comment