Pratham Software
Integreon Interview Questions and Answers
Q1. what is react and workingwhich site
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.
Q2. What is oops principles
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 object and ignoring the non-essential ones.
Example: A car o...read more
Q3. what is loops and how we use
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
Q4. what is callback hell
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
Q5. what is child process
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.
Q6. How event emitter works.
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 create custom events and handle them.
Q7. OOP concepts Write a class.
A class representing a car with properties and methods.
Create a class named Car
Add properties like make, model, year, color
Include methods like start(), stop(), accelerate(speed), brake()
Example: class Car { constructor(make, model, year, color) { this.make = make; this.model = model; this.year = year; this.color = color; } start() { console.log('Car started'); } stop() { console.log('Car stopped'); } accelerate(speed) { console.log(`Car accelerating at ${speed} mph`); } brak...read more
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