ProDevAns Technologies Interview Questions and Answers

I/O streams are channels through which data can be transferred between a program and an external source or destination.

• I/O streams can be used for reading input from a keyboard or file

• I/O streams can be used for writing output to a screen or file

• I/O streams can be used for network communication

Middleware is software that acts as a bridge between different applications or components, allowing them to communicate and work together.

• Middleware facilitates communication between different software components

• It can handle tasks such as data transformation, security, and routing

• Examples include message brokers like RabbitMQ, API gateways like Kong, and web servers like Nginx

A callback is a function that is passed as an argument to another function and is executed after a specific event occurs.

• Used in asynchronous programming to handle responses or events

• Allows for more flexible and modular code

• Commonly used in JavaScript for event handling

Virtual DOM is a lightweight representation of the actual DOM, optimizing updates and rendering in web applications.

• Virtual DOM is a concept used in libraries like React to improve performance.

• It creates a virtual representation of the UI in memory, allowing efficient updates.

• When changes occur, the Virtual DOM is updated first, then compared to the actual DOM.

• This process is called 'reconciliation', where only the necessary changes are applied.

• Example: In React, when a compo...read more

Git Merge combines branches, preserving history; Git Rebase rewrites history for a cleaner, linear project history.

• Merge creates a new commit that combines changes from two branches.

• Rebase moves or combines a sequence of commits to a new base commit.

• Merge preserves the original context of the branches, showing the true history.

• Rebase creates a linear history, making it easier to follow the project timeline.

• Example of Merge: git merge feature-branch merges it into main.

• Example...read more