Netcracker Technology Front end Developer Interview Questions and Answers for Experienced

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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Q1. Basic JS concepts and programming related to them
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Q2. HTML, CSS questions
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Q3. Framework knowledge
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Q1. Problem solving related to algorithms and data structures
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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?
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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. Clousers in Javascript
Ans. 
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. Javascript question
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Q1. Angular basics regarding lifecycle hooks, rxjs, data bindingetc
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Q2. Coding to find the common characters comparing 3 strings
Ans. 
Finding common characters in 3 strings using coding
• Create a function that takes in 3 strings as input

• Iterate through each character of the first string and check if it exists in the other 2 strings

• Store the common characters in an array and return it
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Topics covered DSA and Javascript