ITSW 3175 D288 Back-End Programming
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Free ITSW 3175 D288 Back-End Programming Questions
Describe how code snippets enhance the learning experience in back-end development exercises.
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Code snippets are not necessary for learning back-end development.
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Code snippets provide concrete examples that help students understand how to implement specific functionalities in their projects.
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Code snippets only serve as a reference for advanced developers.
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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.
What is the primary purpose of Express.js in back-end development?
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To perform data analysis
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To manage database connections
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To build APIs and web applications
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To handle front-end user interfaces
Explanation
Explanation:
Express.js is a web application framework for Node.js that simplifies the process of building server-side applications and APIs. It provides routing, middleware support, and request/response handling, allowing developers to efficiently create web servers and RESTful APIs. Express.js is focused on back-end development and does not directly handle data analysis, database connections, or front-end interfaces. Its primary purpose is to streamline the development of web servers and APIs.
Correct Answer:
To build APIs and web applications
If you need to connect to a MongoDB database hosted on a cloud service, what would you include in the URL parameter of the MongoClient.connect method?
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The name of the database only
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A static URL for local development
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The cloud service's connection string
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The local IP address of the database
Explanation
Explanation:
When connecting to a MongoDB database hosted on a cloud service, the MongoClient.connect method requires the full connection string provided by the service. This URL includes the protocol, username, password, host, port, and database name, allowing the Node.js application to authenticate and connect securely to the remote database. Simply using the database name, a local IP, or a static local URL will not enable connection to a cloud-hosted database.
Correct Answer:
The cloud service's connection string
Describe the purpose of the sort() method in MongoDB queries.
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The sort() method is used to arrange the query results in a specified order based on one or more fields.
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The sort() method is used to limit the number of results returned by a query.
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The sort() method is used to filter out unwanted results from a query.
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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.
If you need to retrieve all documents from a MongoDB collection where the 'status' field is 'active', which method would you use and how would you specify the criteria?
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You would use the insert method with the criteria { status: 'active' }.
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You would use the delete method with the criteria { status: 'active' }.
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You would use the find method with the criteria { status: 'active' }.
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You would use the update method with the criteria { status: 'active' }.
Explanation
Explanation:
To retrieve documents that match specific criteria in MongoDB, the find() method is used. By passing a filter object such as { status: 'active' } to find(), MongoDB returns all documents in the collection where the status field equals "active". This method is intended for querying and retrieving data, whereas insert(), delete(), and update() are used for modifying the collection rather than reading documents.
Correct Answer:
You would use the find method with the criteria { status: 'active' }.
Describe the purpose of the deleteOne() method in MongoDB.
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The deleteOne() method creates a new document in a MongoDB collection.
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The deleteOne() method retrieves documents from a MongoDB collection.
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The deleteOne() method updates a document in a MongoDB collection.
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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.
To delete a document from a collection use the ______ function or the ______ function with a criteria
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clean(), destroyOne()
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destroy(), cleanOne()
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remove(), deleteOne()
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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()
What is the purpose of the sort method in MongoDB?
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To update existing documents in the database.
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To connect to the MongoDB database.
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To order the results of a query based on specified fields in ascending or descending order.
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To filter documents based on specific criteria.
Explanation
Explanation:
In MongoDB, the sort() method is used to organize the results of a query according to specified fields. Developers can define the sort order as ascending or descending for one or more fields, which helps in presenting or processing data in a structured manner. Unlike methods for updating, connecting, or filtering documents, sort() does not modify the data or select documents—it only arranges the query output based on the specified criteria.
Correct Answer:
To order the results of a query based on specified fields in ascending or descending order.
Which method would you use to insert a single document into a MongoDB collection?
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createDocument()
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addDocument()
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insertOne()
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insertMany()
Explanation
Explanation:
In MongoDB, the insertOne() method is specifically used to insert a single document into a collection. This method takes the document to be inserted as its argument and adds it to the specified collection. insertMany() is used for inserting multiple documents at once, while createDocument() and addDocument() are not valid MongoDB methods. insertOne() ensures that only the provided document is added, making it the correct choice for single-document insertion.
Correct Answer:
insertOne()
What is the primary purpose of the find method in MongoDB?
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To retrieve documents from a collection that match specified criteria.
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To delete documents from a collection.
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To insert new documents into a collection.
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To update existing documents in a collection.
Explanation
Explanation:
The find method in MongoDB is used to query a collection and retrieve documents that match specific criteria. It returns a cursor, which can then be iterated over or converted into an array for processing. This method is central to reading data from the database, allowing developers to filter, project, and sort results as needed. It does not delete, insert, or update documents; its primary function is to locate and return data according to the query parameters.
Correct Answer:
To retrieve documents from a collection that match specified criteria.
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