What is the primary role of the app object in an Express application
- The app object handles routing and middleware functions.
- The app object initializes the Node.js server.
- The app object manages the database connections
- The app object controls the client-side code.
The primary role of the app object in an Express application is to handle routing and middleware functions. It defines the routes for handling different HTTP requests (GET, POST, etc.) and can use middleware to add functionality to these routes, such as authentication or error handling. The other options do not accurately describe the role of the app object in Express.
Which of the following is a primary feature of a testing framework like Mocha or Jest?
- Test Automation
- Database Management
- Graphic Design
- Web Development
A primary feature of testing frameworks like Mocha or Jest is Test Automation. These frameworks allow developers to write and run automated tests to verify that their code works correctly. This includes unit tests, integration tests, and more.
Which of the following is true regarding the 'this' keyword inside an arrow function?
- The 'this' keyword in an arrow function refers to the global object.
- The 'this' keyword in an arrow function refers to the object that contains the arrow function.
- Arrow functions do not have a 'this' keyword.
- The 'this' keyword in an arrow function refers to the 'this' value of the containing lexical context.
In arrow functions, the value of 'this' is inherited from the surrounding lexical context, which means it refers to the 'this' value of the containing function or block. Unlike regular functions, arrow functions do not have their own 'this' binding.
How do you install a specific version of a package using npm?
- npm install
@ - npm get
@ - npm add
@ - npm update
@
To install a specific version of a package using npm, you should use the npm install @ command. This allows you to specify the exact version you want to install. The other options do not provide the same functionality or may not work as expected.
Which method of the response object is used to end the response process in an HTTP server?
- response.end()
- response.finish()
- response.complete()
- response.stop()
The response.end() method is used to end the response process in an HTTP server. It finalizes the response and sends it to the client. The other options are not valid methods for ending the response.
What will happen if you try to destructure properties not present in the object?
- The properties will be assigned undefined, and no error will be thrown.
- It will throw a "Property not found" error.
- The properties will be ignored, and no action will be taken.
- The code will fail to compile.
When destructuring properties not present in the object, they will be assigned undefined, and no error will be thrown. This is useful for handling optional properties or providing default values.
Pug was formerly known as ______ before it was renamed.
- Jade
- Twig
- Slim
- Haml
Pug was previously known as "Jade" before it was renamed due to a trademark issue. The other options are different templating engines and not related to Pug.
You are designing a large-scale e-commerce platform that requires fast and accurate search functionality. What indexing and search strategies would you employ to ensure that users can find products efficiently and accurately?
- Implement Inverted Indexes and Use Distributed Search Engines
- Implement Relational Database Indexes Only
- Utilize Full-Text Search Indexing for Product Descriptions
- Employ In-Memory Caching for Frequent Queries
To ensure fast and accurate search functionality in a large-scale e-commerce platform, employing Inverted Indexes and Distributed Search Engines is a common strategy. These technologies allow for efficient and scalable search operations, as they pre-process and index the data in a way that speeds up retrieval. Full-Text Search Indexing is useful for searching within product descriptions. In-memory caching can further enhance query performance by storing frequently accessed data in memory. However, it's not a substitute for proper indexing and search strategies.
In a distributed database system, achieving ______ can be challenging during CRUD operations due to network partitions.
- Consistency
- Availability
- Partition Tolerance
- Latency
In a distributed database system, the CAP theorem states that you can achieve only two out of three properties: Consistency, Availability, and Partition Tolerance (CAP). During network partitions (Partition Tolerance), it can be challenging to maintain both Consistency and Availability, making it an essential trade-off.
In Node.js, to interact with SQL databases, an ORM like ______ can be used.
- Sequelize
- MongoDB
- Express
- Mongoose
In Node.js, Sequelize is a popular Object-Relational Mapping (ORM) library used to interact with SQL databases. It provides an abstraction layer for working with databases, making it easier to manage and query relational data. Options 2, 3, and 4 are not ORMs and are not used for SQL databases.