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 100 + 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.
Trouble sleeping before an exam? Sleep well after using our ITSW 3175 D288 Back-End Programming questions.
Free ITSW 3175 D288 Back-End Programming Questions
If you want to delete a user document with the username 'john_doe' from a MongoDB collection, which code snippet would you use?
-
collection.drop({ username: 'john_doe' });
-
collection.delete({ username: 'john_doe' });
-
collection.remove({ username: 'john_doe' });
-
collection.deleteOne({ username: 'john_doe' });
Explanation
Explanation:
To delete a single document in MongoDB that matches a specific condition, the deleteOne method is the appropriate choice. In this example, collection.deleteOne({ username: 'john_doe' }) will remove exactly one document where the username field matches 'john_doe'. Other methods such as drop are used to remove entire collections, remove is an older method that can delete multiple documents, and delete is not a valid MongoDB method.
Correct Answer:
collection.deleteOne({ username: 'john_doe' });
Describe the purpose of the deleteOne() method in MongoDB.
-
The deleteOne() method creates a new document in a MongoDB collection.
-
The deleteOne() method retrieves documents from a MongoDB collection.
-
The deleteOne() method updates a document in a MongoDB collection.
-
The deleteOne() method is used to remove a single document that matches a specified filter from a MongoDB collection.
Explanation
Explanation:
The deleteOne() method in MongoDB is designed to remove a single document from a collection that meets the criteria specified in a filter object. This method ensures that only the first document matching the filter is deleted, leaving other documents unaffected. It is commonly used in scenarios where precise deletion is required, such as removing a user by username or email. It does not create, update, or retrieve documents—it solely performs targeted deletion.
Correct Answer:
The deleteOne() method is used to remove a single document that matches a specified filter from a MongoDB collection.
If you want to retrieve a list of users from a MongoDB collection sorted by their registration date in descending order, which code snippet would you use?
-
collection.find().sort({ registrationDate: 1 })
-
collection.find().filter({ registrationDate: -1 })
-
collection.find().sort({ registrationDate: -1 })
-
collection.find().orderBy({ registrationDate: -1 })
Explanation
Explanation:
In MongoDB, the sort() method is used to order query results based on specified fields. To sort documents by registrationDate in descending order, you pass { registrationDate: -1 } to the sort() method. Using 1 would sort in ascending order, while filter() and orderBy() are not valid MongoDB methods for sorting results. This approach ensures the users are retrieved starting from the most recently registered.
Correct Answer:
collection.find().sort({ registrationDate: -1 })
Describe the significance of CRUD operations in back-end development.
-
CRUD operations are only relevant for front-end development.
-
CRUD operations are fundamental for managing data in a database, allowing applications to create, read, update, and delete records.
-
CRUD operations are used to secure databases from unauthorized access.
-
CRUD operations are primarily concerned with user interface design.
Explanation
Explanation:
CRUD operations—Create, Read, Update, and Delete—form the core functionality of back-end development by enabling applications to manage data in a database. They allow developers to add new records, retrieve existing records, modify data, and remove unnecessary or outdated information. Understanding and implementing CRUD operations is essential for building functional APIs and server-side applications, as they define how the application interacts with persistent data. These operations are not limited to front-end development or security and do not pertain directly to user interface design.
Correct Answer:
CRUD operations are fundamental for managing data in a database, allowing applications to create, read, update, and delete records.
Describe how the express.json middleware enhances the functionality of an Express.js application.
-
The express.json middleware enhances functionality by allowing the application to easily handle JSON data from incoming requests, making it accessible through req.body.
-
The express.json middleware is used to validate user authentication for incoming requests.
-
The express.json middleware improves performance by caching responses for faster delivery.
-
The express.json middleware allows the application to serve HTML files directly.
Explanation
Explanation:
The express.json middleware is a built-in function in Express.js that parses incoming requests with JSON payloads and makes the data available on req.body. This allows the server to easily read and manipulate JSON data sent from clients, which is a common format for API requests. Without this middleware, JSON data in requests would not be automatically parsed, requiring manual handling. It does not handle authentication, improve caching performance, or serve HTML files; its primary purpose is to enable seamless processing of JSON request bodies.
Correct Answer:
The express.json middleware enhances functionality by allowing the application to easily handle JSON data from incoming requests, making it accessible through req.body.
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' })
Describe how code snippets enhance the learning experience in back-end development exercises.
-
Code snippets are not necessary for learning back-end development.
-
Code snippets provide concrete examples that help students understand how to implement specific functionalities in their projects.
-
Code snippets only serve as a reference for advanced developers.
-
Code snippets are used to replace the need for documentation.
Explanation
Explanation:
Code snippets play a critical role in back-end development learning by providing practical, concrete examples of how to implement specific features or operations. They allow students to see the exact syntax, structure, and flow of code in action, making abstract concepts more tangible. By experimenting with and modifying these snippets, students gain hands-on experience, reinforcing their understanding and improving their ability to write functional back-end code in real-world scenarios. Code snippets complement documentation rather than replace it and are valuable for learners at all levels, not just advanced developers.
Correct Answer:
Code snippets provide concrete examples that help students understand how to implement specific functionalities in their projects.
Describe the role of the find method in the context of database operations in MongoDB.
-
The find method is used to insert new data into a collection.
-
The find method is used to update existing documents in a collection.
-
The find method is used to delete documents from a collection.
-
The find method is used to query a collection and return documents that meet certain conditions.
Explanation
Explanation:
In MongoDB, the find method is used to query a collection and retrieve documents that match specified filter criteria. It returns a cursor, which can then be iterated over or converted to an array for further processing. This method is essential for reading and retrieving data based on conditions, enabling developers to access only the relevant documents without modifying the collection. Unlike insert, update, or delete methods, find does not alter the data; it strictly retrieves matching documents.
Correct Answer:
The find method is used to query a collection and return documents that meet certain conditions.
The MongoDB shell provides the following methods to insert only one document into a collection:
-
All of the others.
-
To insert a single document, use db.collection.insertOne().
-
None of the others.
-
To insert a single document, use db.collection.makeOne().
-
To insert a single document, use db.collection.createOne().
Explanation
Explanation:
In MongoDB, to insert a single document into a collection, the correct method is db.collection.insertOne(). This method allows you to add exactly one document at a time to the specified collection. The other options, makeOne() and createOne(), are not valid MongoDB shell methods, and "All of the others" or "None of the others" are incorrect because only insertOne() is the valid method. This makes db.collection.insertOne() the standard approach for inserting a single document in MongoDB.
Correct Answer:
To insert a single document, use db.collection.insertOne().
What does the db.collection method allow you to do in MongoDB?
-
Connect to a remote server.
-
Delete a database.
-
Create a new database.
-
Access a specific collection within a database.
Explanation
Explanation:
In MongoDB, the db.collection method is used to access a specific collection within the current database. It provides a reference to the collection, allowing developers to perform operations such as querying, inserting, updating, and deleting documents. This method does not create a new database or delete one, nor is it used for connecting to a server. Instead, it serves as the primary interface for interacting with a specific collection within an already selected database.
Correct Answer:
Access a specific collection within a database.
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 .