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.
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.
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 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.
Which method is commonly used in Node.js to handle errors in callbacks?
- try...catch
- process.exit()
- console.error()
- callback(error)
In Node.js, it's common to handle errors in callbacks by passing an error object as the first argument to the callback function. This allows the callback to check if an error occurred during the asynchronous operation and take appropriate action. The other options (try...catch, process.exit(), and console.error()) are not used to handle errors in callbacks but serve different purposes.
Which method can be used to add new elements to an array in JavaScript?
- append()
- push()
- add()
- insert()
To add new elements to an array in JavaScript, you should use the push() method. It adds one or more elements to the end of an array. The other options are not valid methods for adding elements to an array in JavaScript.
What is the significance of the process.nextTick() method in Node.js?
- It schedules a callback function to be executed in the next iteration of the event loop, immediately after the current operation is complete.
- It delays the execution of a callback function for a specific number of milliseconds.
- It cancels the execution of a callback function.
- It executes the callback function asynchronously in a new Node.js process.
process.nextTick() is used to schedule a callback function to be executed in the next iteration of the event loop, immediately after the current operation is complete. This allows for efficient asynchronous code execution. The other options do not accurately describe the purpose of process.nextTick().
You are designing a schema for a database that needs to support real-time analytics. What factors would you consider to optimize the read performance of the database?
- Indexing relevant columns for faster retrieval.
- Implementing caching mechanisms to reduce database load.
- Using NoSQL databases for flexibility.
- Denormalizing data for quicker query performance.
When designing a schema for real-time analytics, indexing relevant columns is crucial as it speeds up data retrieval. Option (2) is also valid, as caching can significantly reduce database load. Option (3) might be a consideration but isn't the primary factor. Option (4) can be a trade-off, and it depends on the specific use case.