Netcracker Technology Front end Developer Interview Questions and Answers for Experienced

Q1. All about the front end basic questions
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Q2. What are all basic CSS properties
Ans. 
Basic CSS properties include color, font-size, margin, padding, and display.
• color

• font-size

• margin

• padding

• display
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Q3. Basic question on javascript
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Q1. Javascript question
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Q1. ES6 concepts, React js over all concepts
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Q1. ES6 concepts, coding
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Q1. Challenges, about current project
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Q1. General questions and joining formalities
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Q1. React js Basic Question
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Q2. Coding Question Giving API to call and show in UI
Ans. 
Create a UI to fetch and display data from a given API endpoint using JavaScript and HTML.
• Use fetch API to call the endpoint: fetch('https://api.example.com/data')

• Handle the response with .then() and convert it to JSON: response.json()

• Display the data in the UI using DOM manipulation: document.getElementById('output').innerHTML = data;

• Consider error handling with .catch() to manage API call failures.

• Use async/await for...read more
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Topics covered DSA and Javascript

Q1. Display a list of items using Pagination concept in React using any online coding editor.
Ans. 
Display a list of items using Pagination concept in React
• Create a list of items to display

• Implement pagination logic to display a limited number of items per page

• Add navigation buttons to switch between pages
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Q2. Check if pair sum exists in the array (Two Sum)?
Ans. 
Check if pair sum exists in the array using a hash map.
• Use a hash map to store the difference between the target sum and each element in the array.

• Iterate through the array and check if the current element exists in the hash map.

• Return true if a pair sum exists, otherwise return false.
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Q3. React LifeCycle?
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React lifecycle methods manage component behavior during its existence, from creation to removal.
• Mounting: Methods like constructor(), render(), and componentDidMount() are called when a component is being created.

• Updating: Methods like shouldComponentUpdate(), render(), and componentDidUpdate() are invoked when a component's state or props change.

• Unmounting: The componentWillUnmount() method is called just before a co...read more
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Q4. How do you improve the performance of a website?
Ans. 
Improving website performance involves optimizing code, reducing server requests, using caching, and optimizing images.
• Optimize code by minifying CSS, JavaScript, and HTML

• Reduce server requests by combining files and using asynchronous loading

• Utilize caching techniques like browser caching and server-side caching

• Optimize images by resizing, compressing, and using modern image formats like WebP
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Q5. What is NextJS?
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NextJS is a React framework that allows for server-side rendering and static site generation.
• NextJS is built on top of React, providing features like server-side rendering and static site generation.

• It simplifies the process of building React applications by handling routing, code splitting, and more out of the box.

• NextJS also supports API routes for serverless functions and data fetching.

• It offers features like automa...read more
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Q1. Clousers in Javascript
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Closures are functions that have access to variables in their outer scope, even after the outer function has returned.
• Closures are created when a function is defined inside another function.

• The inner function has access to the outer function's variables and parameters.

• Closures can be used to create private variables and methods.

• Closures can also be used to create functions with pre-set arguments.
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Q2. Difference between use ref and create ref
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useRef is a hook used to create a mutable ref object, while createRef is a method used to create a ref object.
• useRef is a hook provided by React, while createRef is a method provided by the React library.

• useRef can be used in functional components to create a mutable ref object that persists across renders.

• createRef is used in class components to create a ref object that can be attached to a DOM element.

• useRef can also...read more
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Q1. Basic JS & React JS question
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Q1. Advance level of JS and React related question and coding skills test as well.
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Q1. What are your salary expectations?
Ans. 
I am open to discussing salary based on the responsibilities and requirements of the position.
• I am flexible and open to negotiation.

• I am looking for a fair and competitive salary.

• I am more interested in the overall compensation package rather than a specific number.

• I would like to be compensated based on my skills, experience, and the value I can bring to the company.
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