The fs.watch method is used to watch for changes in a file or a directory but may not be consistent across platforms due to its reliance on ______.
- inotify
- polling
- event-driven
- file system events
The fs.watch method relies on polling on some platforms to detect file and directory changes. This polling approach may not be consistent across platforms and can have performance implications.
In Express.js, the ______ method is commonly used to protect routes and ensure that only authenticated users can access them.
- authenticate
- secure
- authorize
- validate
In Express.js, the authorize method is commonly used to protect routes and ensure that only authenticated users can access them. This is often achieved through middleware functions that check for authentication and authorization before allowing access. The other options may not be standard methods for this purpose in Express.js.
Which method in Express.js is used to serve static files?
- app.static()
- app.useStatic()
- app.serveStatic()
- app.use()
In Express.js, the app.use(express.static()) method is used to serve static files. This method allows you to specify a directory from which Express should serve static assets like images, CSS, and JavaScript. The other options are not valid methods for serving static files in Express.
You are tasked with improving the performance of a database that experiences heavy read and write operations. How would you balance the use of indexing to improve read performance while minimizing the impact on write performance?
- Add Indexes to All Columns for Faster Reads
- Use Covering Indexes for Frequently Queried Columns
- Implement Partitioned Tables to Isolate Write-Intensive Data
- Regularly Rebuild All Indexes for Maximum Performance
To balance the use of indexing in a database with heavy read and write operations, it's crucial to use Covering Indexes for frequently queried columns. These indexes include all the necessary data for the query, reducing the need to access the main table. Implementing Partitioned Tables can isolate write-intensive data from read-intensive data, improving write performance. Adding indexes to all columns and regularly rebuilding all indexes can lead to unnecessary overhead and hinder write performance.
Which method should be used to handle the rejection of a Promise?
- reject()
- catch()
- error()
- failure()
To handle the rejection of a Promise, you should use the catch() method. It allows you to specify what to do when the Promise is rejected with an error. The other options are not standard methods for handling Promise rejection in JavaScript.
Connection to a NoSQL database like MongoDB in Node.js usually returns a ______ object.
- MongoClient
- Promise
- HttpServer
- Buffer
When connecting to a NoSQL database like MongoDB in Node.js, you typically get a MongoClient object. This object represents the database connection and allows you to perform various database operations. The other options are not related to MongoDB connections.
What is the significance of the HTTP status code in the response of an Express API, and how does it affect client-server interaction?
- HTTP status codes are optional and don't impact client-server interaction
- HTTP status codes indicate the type of response and guide client behavior
- HTTP status codes are primarily for server documentation
- HTTP status codes are used to encrypt the API response
HTTP status codes are essential in the response of an Express API. They indicate the type of response and guide client behavior. For example, a 200 OK status indicates success, while a 404 Not Found status indicates a resource was not found. Proper status codes enhance communication and handling between the client and server.
When a JavaScript function is executed, a new execution context is created, and a special object called ________ is created.
- "this"
- "global"
- "function"
- "execution"
When a JavaScript function is executed, a new execution context is created, and a special object called the "execution context" is created. This execution context contains information about the function's variables and scope.
In a token-based authentication system, using a ______ approach helps in reducing the risk of token interception and replay attacks.
- Stateless
- Stateful
- Hybrid
- Cookie-based
In a token-based authentication system, a "stateless" approach is used to reduce the risk of token interception and replay attacks. Stateful approaches require server-side storage, while stateless approaches are based on self-contained tokens, which do not rely on server-side storage, making them more secure.
In Node.js, which method is used to establish a connection to a MongoDB database?
- connectToMongo()
- openConnection()
- mongoose.connect()
- establishMongoDBConnection
In Node.js, the method used to establish a connection to a MongoDB database is mongoose.connect(). Mongoose is a widely used Node.js library for MongoDB that provides an elegant way to define data schemas and interact with MongoDB. The other options do not represent the standard way to connect to a MongoDB database in Node.js.
How can you implement inheritance between two objects in JavaScript?
- Prototypal Inheritance
- Object Composition
- Class Inheritance
- Functional Inheritance
In JavaScript, inheritance can be implemented through Prototypal Inheritance. Objects can inherit properties and methods from other objects by setting their prototype. The other options describe alternative approaches to code reuse and object creation but don't involve direct inheritance.
When connecting to a SQL database in Node.js, the ______ method is commonly used to execute SQL queries.
- query()
- execSQL()
- runQuery()
- execute()
When connecting to a SQL database in Node.js, the query() method is commonly used to execute SQL queries. This method is provided by most SQL database libraries for Node.js and allows you to send SQL queries to the database. Options 2, 3, and 4 are not standard methods for executing SQL queries in Node.js.