ITSW 3175 D288 Back-End Programming
Access The Exact Questions for ITSW 3175 D288 Back-End Programming
💯 100% Pass Rate guaranteed
🗓️ Unlock for 1 Month
Rated 4.8/5 from over 1000+ reviews
- Unlimited Exact Practice Test Questions
- Trusted By 200 Million Students and Professors
What’s Included:
- Unlock Actual Exam Questions and Answers for ITSW 3175 D288 Back-End Programming on monthly basis
- Well-structured questions covering all topics, accompanied by organized images.
- Learn from mistakes with detailed answer explanations.
- Easy To understand explanations for all students.
Free ITSW 3175 D288 Back-End Programming Questions
What is the purpose of the toArray method in MongoDB?
-
It converts the cursor returned by a query into an array of documents.
-
It deletes documents from the database.
-
It filters documents based on specified criteria.
-
It updates existing documents in the database.
Explanation
Explanation:
In MongoDB, methods like find() return a cursor, which is an iterator over the query results. The toArray() method converts this cursor into a standard JavaScript array containing all the documents that match the query. This is particularly useful when a developer wants to work with the entire set of results in memory, perform array operations, or send the results as a response in an application. It does not delete, filter, or update documents; its sole function is to transform the cursor into an array for easier processing.
Correct Answer:
It converts the cursor returned by a query into an array of documents.
In a scenario where a user submits a form to create a new account, which HTTP method should be used to send the form data to the server?
-
PUT request
-
HEAD request
-
GET request
-
POST request
Explanation
Explanation:
When a user submits a form to create a new account, the POST method is used to send the form data to the server. POST requests are designed to submit data to a server to create a new resource or trigger server-side processing. Unlike GET requests, POST requests include the data in the request body, which is more secure and allows for larger amounts of data. PUT is generally used for updating resources, and HEAD is used to retrieve headers without the body.
Correct Answer:
POST request
If you want to count the number of documents in a MongoDB collection where the 'status' field is 'active', which code snippet would you use?
-
collection.find({ status: 'active' }).count()
-
collection.aggregate([{ \(match: { status: 'active' } }, {\)count: 'total' }])
-
collection.count({ status: 'active' })
-
collection.countDocuments({ status: 'active' })
Explanation
Explanation:
The countDocuments() method in MongoDB is the recommended way to count the number of documents that match a specified filter. Using collection.countDocuments({ status: 'active' }) returns the total number of documents where the status field is 'active'. Other methods, such as find().count(), are older approaches and may not be as precise or efficient, while aggregate() can perform counting but is more complex and typically used for advanced aggregations. collection.count() is deprecated in favor of countDocuments().
Correct Answer:
collection.countDocuments({ status: 'active' })
What does the updateOne method in MongoDB specifically target?
-
Multiple documents that match the filter
-
All documents in the collection
-
A single document that matches the specified filter
-
A single document without any filter
Explanation
Explanation:
The updateOne method in MongoDB is designed to update a single document that matches the specified filter criteria. It allows developers to modify specific fields or values within a document while leaving other documents in the collection unaffected. If multiple documents match the filter, only the first matching document is updated. This method does not update all documents in the collection or operate without a filter; it specifically targets one document per operation.
Correct Answer:
A single document that matches the specified filter
Describe the purpose of the sort() method in MongoDB queries.
-
The sort() method is used to arrange the query results in a specified order based on one or more fields.
-
The sort() method is used to limit the number of results returned by a query.
-
The sort() method is used to filter out unwanted results from a query.
-
The sort() method is used to group query results by a specific field.
Explanation
Explanation:
In MongoDB, the sort() method is used to order the results of a query according to one or more fields in either ascending or descending order. This allows developers to control how documents are presented, such as sorting users by age or orders by date. The method does not limit the number of results, filter out documents, or group results; it strictly organizes the output based on the specified sort criteria, enhancing data presentation and usability.
Correct Answer:
The sort() method is used to arrange the query results in a specified order based on one or more fields.
What do code snippets in practical exercises help students with?
-
Writing documentation
-
Debugging code errors
-
Creating user interfaces
-
Implementing specific functionalities
Explanation
Explanation:
Code snippets in practical exercises help students implement specific functionalities by providing concrete examples of how to apply programming concepts. They allow learners to see the structure and logic of working code, enabling them to practice coding tasks, understand workflows, and develop problem-solving skills. While they may indirectly aid in debugging or learning UI design, their primary purpose is to demonstrate and guide the implementation of particular features or operations in a practical context.
Correct Answer:
Implementing specific functionalities
If a developer wants to find all users in a MongoDB collection who are older than 30 years, which of the following queries would correctly implement querying by field?
-
db.users.insert({ age: 30 })
-
db.users.find({ age: { $gt: 30 } })
-
db.users.deleteMany({ age: 30 })
-
db.users.update({ age: { $lt: 30 } })
Explanation
Explanation:
To query documents in MongoDB based on a field condition, the find() method is used along with a filter specifying the condition. In this case, { age: { \(gt: 30 } } correctly filters for users whose age is greater than 30. The\)gt operator stands for "greater than." Other options like insert() add documents, deleteMany() removes documents, and update() modifies documents, none of which are suitable for retrieving documents based on a query.
Correct Answer:
db.users.find({ age: { $gt: 30 } })
To delete a document from a collection use the ______ function or the ______ function with a criteria
-
clean(), destroyOne()
-
destroy(), cleanOne()
-
remove(), deleteOne()
-
delete(), removeOne()
Explanation
Explanation:
In MongoDB and Mongoose, deleting a document from a collection can be done using either the remove() function or the deleteOne() function, both of which allow specifying criteria to identify the document to be deleted. The remove() function is an older method but still available, whereas deleteOne() is the recommended modern approach for removing a single document. These functions target documents that match the provided filter, ensuring precise deletion without affecting unrelated documents.
Correct Answer:
remove(), deleteOne()
Which method in MongoDB is specifically designed to count documents in a collection?
-
aggregate()
-
find()
-
insertOne()
-
countDocuments()
Explanation
Explanation:
The countDocuments() method in MongoDB is designed to count the number of documents in a collection that match a specified filter. Unlike find(), which retrieves documents, or insertOne(), which adds a new document, countDocuments() provides an efficient way to get the total number of matching records. While aggregate() can also perform counting with additional operations, countDocuments() is specifically tailored for counting purposes and is simpler to use when only the total number is needed.
Correct Answer:
countDocuments()
What does the acronym CRUD stand for in the context of database operations?
-
Connect, Retrieve, Update, Delete
-
Create, Retrieve, Update, Destroy
-
Create, Read, Upload, Delete
-
Create, Read, Update, Delete
Explanation
Explanation:
CRUD is an acronym that represents the four fundamental operations of persistent storage in a database: Create, Read, Update, and Delete. These operations correspond to adding new records, retrieving existing records, modifying existing records, and removing records, respectively. Understanding CRUD operations is essential for back-end development because they form the basis of interacting with databases and building functional applications that manage data effectively.
Correct Answer:
Create, Read, Update, Delete
How to Order
Select Your Exam
Click on your desired exam to open its dedicated page with resources like practice questions, flashcards, and study guides.Choose what to focus on, Your selected exam is saved for quick access Once you log in.
Subscribe
Hit the Subscribe button on the platform. With your subscription, you will enjoy unlimited access to all practice questions and resources for a full 1-month period. After the month has elapsed, you can choose to resubscribe to continue benefiting from our comprehensive exam preparation tools and resources.
Pay and unlock the practice Questions
Once your payment is processed, you’ll immediately unlock access to all practice questions tailored to your selected exam for 1 month .