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
Describe the process and outcome of using the deleteOne method in MongoDB.
-
The deleteOne method updates all documents in a collection that match a given condition.
-
The deleteOne method removes one document from a collection that meets the criteria defined in the filter.
-
The deleteOne method inserts a document into a collection if it does not already exist.
-
The deleteOne method retrieves a single document from a collection based on its ID.
Explanation
Explanation:
The deleteOne() method in MongoDB is used to remove a single document from a collection that matches the specified filter criteria. It deletes the first document found that meets the condition, ensuring that only one record is removed. This operation does not update, insert, or retrieve documents; its sole purpose is to remove a targeted document based on the provided filter. If no document matches the filter, the method completes successfully but does not delete any document.
Correct Answer:
The deleteOne method removes one document from a collection that meets the criteria defined in the filter.
If you need to update a user's email address in a MongoDB collection using the updateOne method, which of the following code snippets correctly demonstrates this operation?
-
db.users.updateOne({ username: 'john_doe' }, { $set: { email: '[email protected]' } });
-
db.users.updateMany({ username: 'john_doe' }, { $set: { email: '[email protected]' } });
-
db.users.updateOne({ email: '[email protected]' }, { $set: { username: 'john_doe' } });
-
db.users.update({ username: 'john_doe' }, { $set: { email: '[email protected]' } });
Explanation
Explanation:
The updateOne() method in MongoDB updates a single document that matches the specified filter. In this case, { username: 'john_doe' } identifies the document, and { $set: { email: '[email protected]' } } updates the email field. updateMany() would affect multiple documents, update() is an older method now replaced by updateOne() and updateMany(), and using the wrong filter would update the incorrect field.
Correct Answer:
db.users.updateOne({ username: 'john_doe' }, { $set: { email: '[email protected]' } });
Describe the purpose of the updateOne() method in MongoDB.
-
The updateOne() method creates a new document in a collection.
-
The updateOne() method deletes a document from a collection.
-
The updateOne() method is used to find a single document in a collection and update it with new data.
-
The updateOne() method retrieves all documents from a collection.
Explanation
Explanation:
The updateOne() method in MongoDB is used to update a single document that matches a specified filter. It allows you to modify one or more fields in the document using update operators such as $set, $inc, or $push. This method does not create, delete, or retrieve documents; its specific role is to locate one matching document and apply the provided updates to it.
Correct Answer:
The updateOne() method is used to find a single document in a collection and update it with new data.
If you want to read all documents from a MongoDB collection and log them to the console, which code snippet would you use?
-
collection.retrieve().then(docs => console.log(docs));
-
collection.find().toArray().then(docs => console.log(docs));
-
collection.fetch().then(docs => console.log(docs));
-
collection.getAll().then(docs => console.log(docs));
Explanation
Explanation:
To read all documents from a MongoDB collection, the find() method returns a cursor, which can be converted into an array using toArray(). Using collection.find().toArray().then(docs => console.log(docs)) retrieves all documents and logs them to the console. Methods like retrieve(), fetch(), or getAll() do not exist in the MongoDB Node.js API, making them invalid for this operation.
Correct Answer:
collection.find().toArray().then(docs => console.log(docs));
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
Which MongoDB aggregation pipeline stage is used to sort the documents based on specified field?
-
$project
-
$match
-
$sort
-
$group
Explanation
Explanation:
In MongoDB’s aggregation framework, the $sort stage is used to order documents in the pipeline based on one or more fields. You can specify the sorting order using 1 for ascending and -1 for descending. Other stages serve different purposes: $match filters documents based on conditions, $project reshapes the documents by including or excluding fields, and $group aggregates documents by a specified key. $sort is the correct stage for ordering results.
Correct Answer:
$sort
What is the purpose of Node.js?
-
To manage relational databases.
-
To create interactive user interfaces.
-
To facilitate client-side scripting.
-
To enable server-side scripting using JavaScript.
Explanation
Explanation:
Node.js is a JavaScript runtime built on Chrome's V8 engine that allows developers to execute JavaScript code on the server side. Its primary purpose is to enable server-side scripting, which allows for the creation of scalable network applications, handling HTTP requests, file operations, and real-time communication. Unlike front-end frameworks or database management tools, Node.js is focused on executing JavaScript outside the browser to build back-end logic and server functionality efficiently.
Correct Answer:
To enable server-side scripting using JavaScript.
What programming feature allows JavaScript to handle asynchronous operations in a synchronous style?
-
Async/await
-
Callbacks
-
Event Loop
-
Promises
Explanation
Explanation:
The async/await feature in JavaScript allows developers to write asynchronous code that looks and behaves like synchronous code. By using async functions and the await keyword, code execution pauses until a promise resolves, making it easier to read and maintain compared to nested callbacks or chained promises. While callbacks and promises are also used for handling asynchronous operations, async/await provides a cleaner and more synchronous-like syntax. The Event Loop manages asynchronous operations internally but does not provide the syntax for synchronous-style coding.
Correct Answer:
Async/await
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.
What is Node.js?
-
A front-end JavaScript framework.
-
A programming language.
-
A back-end JavaScript runtime environment.
-
A database management system.
Explanation
Explanation:
Node.js is a back-end JavaScript runtime environment that allows developers to execute JavaScript code on the server side. It is built on Chrome's V8 engine and enables the development of scalable network applications, including web servers and APIs. Unlike front-end frameworks or databases, Node.js focuses on server-side operations, event-driven programming, and asynchronous I/O to handle multiple requests efficiently.
Correct Answer:
A back-end JavaScript runtime environment.
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 .