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.

How do you include partial views in EJS templates?

  • <%- include('partial') %>
  • <% include('partial') %>
  • <% partial('partial') %>
  • <%- partial('partial') %>
In EJS, you can include partial views using the <%- include('partial') %> syntax. This allows you to reuse and insert content from other EJS files into your main template, helping you create modular and maintainable views. The other options are not the correct syntax for including partials in EJS.

How can you send JSON data as a response using the http module in Node.js?

  • response.sendJSON(jsonDat
  • response.write(JSON.stringify(jsonData))
  • response.json(jsonData)
  • response.send(jsonData)
To send JSON data as a response using the http module in Node.js, you should use response.write(JSON.stringify(jsonData)). This method writes the JSON data as a string to the response. The other options are not valid methods for sending JSON data in the http module.

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.

In E2E testing, tests are executed in an environment that simulates a ________ user environment.

  • production
  • controlled
  • real
  • isolated
In End-to-End (E2E) testing, tests are executed in an environment that simulates a real user environment. This means the tests mimic the actions and interactions of real users with the application, helping ensure that the application works as expected in a production-like setting. While controlled and isolated environments may be used in testing, they are not the primary focus of E2E testing. Production environments are typically not used for testing to avoid risks to the live system.

How can you prevent replay attacks when using OAuth 2.0?

  • Use Nonce Values
  • Use Long-lived Tokens
  • Use Weak Passwords
  • Use Static Client IDs
Preventing replay attacks in OAuth 2.0 involves using Nonce values (number used once) to ensure that each request is unique and can't be replayed. Nonces are typically used with authorization codes to add an extra layer of security. The other options are not effective in preventing replay attacks.