Pratham Software Interview Questions and Answers

Q1. Definition. node js , callback, eventloop
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Q2. What is callback hell
Ans. 
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
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Q3. What is react and workingwhich site
Ans. 
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.
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Q4. What is loops and how we use
Ans. 
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
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Q5. What is child process
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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.
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Q1. Understanding of existing project you worked on, how would you handle a scenario in your existing project.
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Q2. Understanding of node js event loop.
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Q3. How event emitter works.
Ans. 
Event emitter is a mechanism in Node.js that allows communication between objects using events.
• Event emitter is a built-in module in Node.js.

• It allows objects to emit named events and register listeners for those events.

• Listeners are functions that are executed when the event is emitted.

• Event emitter is commonly used in Node.js for handling asynchronous operations.

• Example: EventEmitter class in Node.js can be used to c
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Write a code which includes inheritance and polymorphism.

Q1. Discuss past experience and why we want to join pratham
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Q1. What is oops principles
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OOPs principles are a set of guidelines that help in designing and implementing object-oriented programs.
• Encapsulation: Hiding the internal details of an object and exposing only the necessary information.

• Inheritance: Creating new classes from existing ones, inheriting their properties and methods.

• Polymorphism: Ability of objects to take on multiple forms or behaviors.

• Abstraction: Focusing on essential features of an o...read more
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Q2. Programming questions
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Q3. Java basics implementation
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Q4. Inheritance questions
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Q1. Coding optimisation process
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Q1. Experience and expectations
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