TCS Technical Lead Interview Questions, Process, and Tips

Events in C# are used to provide a way for objects to communicate with each other. Freezable objects in WPF allow for efficient memory usage and improved performance.

• Events allow for loosely coupled communication between objects

• They are used to notify subscribers when an action occurs

• Freezable objects can be shared across multiple threads and can be modified without creating a new instance

• They are used in WPF to improv...read more

Explaining @Transactional, Authentication vs Authorization, and Cookies vs Session

• By default, @Transactional rolls back on unchecked exceptions

• Authentication is verifying the identity of a user, while Authorization is granting access to resources based on their role

• Cookies are stored on the client-side, while sessions are stored on the server-side

• Sessions are preferred for security reasons, as cookies can be easily man...read more

Map applies a function to each element and returns a new stream, while flatMap applies a function that returns a stream and flattens the result.

• Map transforms each element of a stream into another element using a function

• FlatMap transforms each element of a stream into a stream of elements using a function and then flattens the result

• Predicate is a functional interface that takes an argument and returns a boolean value

Event loop is a mechanism in Node.js that allows non-blocking I/O operations to be performed efficiently.

• Event loop is responsible for handling all the asynchronous callbacks in Node.js

• It continuously checks the event queue for any pending event and executes them one by one

• It allows Node.js to handle multiple requests simultaneously without blocking the execution of other requests

• Event loop is a single-threaded mechani...read more

Node.js is popular due to its event-driven, non-blocking I/O model, scalability, and ease of use.

• Node.js allows for efficient handling of a large number of simultaneous connections

• It is built on top of Google's V8 JavaScript engine, making it fast and efficient

• Node.js has a large and active community, with many useful libraries and modules available

• It can be used for both server-side and client-side development

• Node.js ...read more

Node.js can be used for building scalable network applications.

• Real-time chat applications

• Streaming applications

• APIs and microservices

• Single-page applications

• Internet of Things (IoT) applications

Streaming in Node.js allows for real-time data processing and transmission.

• Node.js provides the 'stream' module for efficient data streaming

• Streams can be readable, writable, or duplex

• Streams can be used for file I/O, network communication, and more

• Examples include piping data between streams, creating custom streams, and using third-party modules like 'socket.io'

Buffer is a temporary storage area for data in Node.js

• Buffers are instances of the Buffer class in Node.js

• They are used to handle binary data

• Buffers can be created in various ways, such as from a string or an array of integers

• They have a fixed size and cannot be resized

• Buffers can be converted to and from other data types, such as strings or arrays

Callbacks are functions passed as arguments to other functions and are executed when a certain event occurs.

• Callbacks are commonly used in asynchronous programming to handle events or responses.

• They allow for non-blocking code execution and can be used to pass data between functions.

• An example of a callback is the event listener in JavaScript, where a function is executed when an event occurs.

• Callbacks can also be used...read more