How can you access the properties of an object in JavaScript?
- object.property
- object.getProperty()
- object.getProperty
- getProperty(object)
To access the properties of an object in JavaScript, you use dot notation like object.property. This is the most common and straightforward way to access object properties. The other options are not standard ways to access object properties.
To optimize write-intensive workloads in a database, it's crucial to minimize the use of ________.
- Indexes
- Locks
- Transactions
- Constraints
To optimize write-intensive workloads in a database, it's crucial to minimize the use of "Locks." Locks can lead to contention and slow down write operations, especially in scenarios with high concurrent writes.
The Buffer.isBuffer(obj) method in Node.js is used to determine if an object is a ______.
- string
- buffer
- stream
- file
The Buffer.isBuffer method is used to determine if an object is a buffer in Node.js. It helps identify whether a given object is a Buffer instance or not.
To avoid blocking the Event Loop with CPU-bound tasks, developers can offload such tasks to ________.
- Worker Threads
- Callbacks
- Promises
- Timers
To avoid blocking the Event Loop with CPU-bound tasks, Node.js developers can offload such tasks to "Worker Threads." This allows for concurrent execution of tasks, ensuring that the Event Loop remains responsive for handling other I/O operations and events.
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.
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.