Benison Technologies Technical Lead Interview Questions and Answers

Callback hell is a situation in asynchronous programming where multiple nested callbacks make the code difficult to read and maintain.

• Occurs when multiple asynchronous operations are nested within each other

• Can lead to deeply nested code which is hard to understand and debug

• Can be mitigated using promises, async/await, or libraries like async.js

React is a JavaScript library for building user interfaces.

• React is used for creating interactive UI components.

• It allows developers to build reusable UI components.

• React uses a virtual DOM for efficient rendering.

• React is commonly used in web development for single-page applications.

Loops are used in programming to repeat a block of code multiple times until a certain condition is met.

• Loops help in automating repetitive tasks

• Types of loops include for, while, and do-while

• Example: for loop to iterate over an array and perform an operation on each element

A child process is a process created by another process, known as the parent process.

• Child processes inherit resources and attributes from the parent process.

• Child processes can communicate with the parent process and other child processes.

• Examples include when a program spawns multiple processes to perform different tasks.