Netcracker Technology Front end Developer Interview Questions and Answers for Experienced

Round duration - 60 Minutes
Round difficulty - Medium

This round consisted of some standard questions related to HTML , CSS , JS and basic Frontend develeoper practices .

Q1. What are the features of HTML5?
Ans. 
HTML5 is the latest version of the HTML standard with new features for web development.
• Support for multimedia elements like <video> and <audio>

• Canvas and SVG for graphics and animations

• Improved form controls and validation

• Offline storage capabilities with Local Storage and IndexedDB

• Geolocation API for location-based services
Answered by AI
Add your answer
Q2. Can you explain the CSS Box Model?
Ans. 
The CSS Box Model is a fundamental concept in CSS that defines the layout and spacing of elements on a webpage.
• The Box Model consists of content, padding, border, and margin.

• Content: The actual content of the box, such as text or images.

• Padding: Space between the content and the border.

• Border: The border surrounding the padding and content.

• Margin: Space outside the border, separating the element from other elements.

• Exa...read more
Answered by AI
Add your answer
Q3. What is prototype chaining in JavaScript?
Ans. 
Prototype chaining in JavaScript is the mechanism by which objects inherit properties and methods from other objects.
• In JavaScript, each object has a prototype property, which points to another object. When a property or method is accessed on an object, JavaScript will look for it in the object itself first, and then in its prototype chain.

• If the property or method is not found in the object, JavaScript will continue t...read more
Answered by AI
Add your answer
Q4. What are media elements in HTML?
Ans. 
Media elements in HTML are used to embed audio and video content on a webpage.
• Media elements include <audio> and <video> tags in HTML.

• They allow for the playback of audio and video files directly on a webpage.

• Attributes like src, controls, autoplay, and loop can be used to customize the behavior of media elements.

• Example: <video src='video.mp4' controls></video>
Answered by AI
Add your answer

Round duration - 70 Minutes
Round difficulty - Medium

This was a preety intense round revolving mainly around the core concepts of JavaScript and React . I was confident about my skills in JavaScript and React as I already had some projects in JS and React and I also completed the Guided Path of JS and React in CodeStudio which boosted my preparation and helped me crack these Frontend Interviews.

Q1. 
Swap Two Numbers Problem Statement
Given two integers a and b, your task is to swap these numbers and output the swapped values.
Input:
The first line contains a single integer 't', representing the num...read more
Ans. 
Swap two numbers 'a' and 'b' and output the swapped values.
• Create a temporary variable to store one of the numbers before swapping

• Assign the value of 'a' to 'b' and the temporary variable to 'a'

• Output the swapped values as 'b' followed by 'a'
Answered by AI
Add your answer
Q2. 
Sort Array Problem Statement
Given an array consisting of 'N' positive integers where each integer is either 0, 1, or 2, your task is to sort the given array in non-decreasing order.
Input:
Each input st...read more
Ans. 
Sort an array of 0s, 1s, and 2s in non-decreasing order.
• Use a counting sort algorithm to count the occurrences of 0s, 1s, and 2s in the array.

• Then reconstruct the array by placing the counted elements in order.

• Time complexity of the counting sort algorithm is O(N).
Answered by AI
Add your answer
Q3. Can you explain promises and their three states?
Ans. 
Promises are objects representing the eventual completion or failure of an asynchronous operation.
• Promises have three states: pending, fulfilled, and rejected.

• Pending: initial state, neither fulfilled nor rejected.

• Fulfilled: operation completed successfully.

• Rejected: operation failed.

• Promises can be chained using .then() to handle success and failure.

• Example: const promise = new Promise((resolve, reject) => { ... })
Answered by AI
Add your answer
Q4. What are callbacks in JavaScript?
Ans. 
Callbacks in JavaScript are functions passed as arguments to other functions, to be executed later.
• Callbacks are commonly used in asynchronous operations, such as event handling or AJAX requests.

• They allow for more flexible and dynamic programming, by defining behavior that should happen after a certain event or task is completed.

• Example: setTimeout function in JavaScript takes a callback function as an argument to be
Answered by AI
Add your answer
Q5. What is the Same-origin policy?
Ans. 
Same-origin policy is a security measure in web browsers that restricts how a document or script loaded from one origin can interact with a resource from another origin.
• It prevents a web page from making requests to a different domain than the one it was loaded from.

• It helps protect user data and prevent malicious attacks like cross-site scripting (XSS).

• Cross-origin resource sharing (CORS) headers can be used to relax
Answered by AI
Add your answer
Q6. Can you explain the lifecycle of components in React?
Ans. 
Components in React go through various stages like mounting, updating, and unmounting.
• Components are created and inserted into the DOM during the mounting phase.

• During the updating phase, components can re-render due to changes in props or state.

• Components are removed from the DOM during the unmounting phase.

• Lifecycle methods like componentDidMount, componentDidUpdate, and componentWillUnmount are used to perform actio
Answered by AI
Add your answer

Round duration - 30 Minutes
Round difficulty - Easy

This was a typical HR round with some standard Behavioral questions like my interests, weaknesses, strengths, family background, are you willing to relocate or travel , why Amdocs, CEO of Amdocs etc.

Q1. Why do you want to work at Amdocs?
Add your answer

Q1. React js Basic Question
Add your answer
Q2. Coding Question Giving API to call and show in UI
Add your answer

Q1. What are your salary expectations?
Add your answer
Q2. What is your family background?
Add your answer
Q3. Share details of your previous job.
Add your answer
Q4. Why should we hire you?
Add your answer
Q5. Why are you looking for a change?
Add your answer
Q6. Where do you see yourself in 5 years?
Add your answer
Q7. What are your strengths and weaknesses?
Add your answer
Q8. Tell me about yourself.
Add your answer
Q9. Tell me about your questions
Add your answer

Find reverse string using array

Q1. What are Routing Guards?
Ans. 
Routing guards are used in Angular to control access to certain routes based on certain conditions.
• Routing guards are used to protect routes in Angular applications.

• They can be used to control access based on authentication status, user roles, etc.

• There are different types of routing guards like CanActivate, CanActivateChild, CanDeactivate, CanLoad.

• Example: CanActivate guard can be used to check if a user is authentica
Answered by AI
Add your answer

Q1. Difference between foreach and map
Ans. 
foreach is used to iterate over an array without returning a new array, while map creates a new array by applying a function to each element.
• foreach does not return a new array, while map does

• foreach does not modify the original array, while map creates a new array

• foreach is used for iterating over elements, while map is used for transforming elements

• Example: foreach - array.forEach(item => console.log(item)), map - ar
Answered by AI
Add your answer
Q2. Explain rxjs operators
Ans. 
RxJS operators are functions that enable complex asynchronous operations and data manipulation in reactive programming.
• RxJS operators are used to transform, filter, combine, and create observables.

• Operators can be categorized into creation operators, transformation operators, filtering operators, combination operators, and utility operators.

• Examples of operators include map, filter, mergeMap, switchMap, debounceTime, a
Answered by AI
Add your answer

Q1. What is Event Loop ? How it works?
Ans. 
Event Loop is a mechanism in JavaScript that manages the execution of code and handles asynchronous operations.
• Event Loop continuously checks the call stack and the message queue.

• If the call stack is empty, it takes the first message from the queue and pushes it onto the call stack.

• If the message is a callback function, it is executed and removed from the call stack.

• If the message is not a callback function, it is pass...read more
Answered by AI
Add your answer
Q2. Make a set of 6 boxes Responsive in CSS
Ans. 
Use CSS to make a set of 6 boxes responsive
• Use percentage or viewport units for width and height

• Use media queries to adjust styles for different screen sizes

• Consider using flexbox or grid for layout

• Avoid using fixed pixel values

• Test on different devices and browsers

• Use CSS frameworks like Bootstrap or Foundation for easier implementation
Answered by AI
Add your answer
Q3. Hoisting & Closures Questions
Add your answer

Q1. What's your Salary expectations ?
Add your answer

How revere the string without using reverse method

Split duplication from the array

Q1. Salary negotiation, asked about my previous employer
Add your answer
Q2. Speak bold at time of salary negotiation
Add your answer