Accelgrowth Technology React Js Frontend Developer Interview Questions and Answers

Q1. Server side rendering, routes
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Q2. Securing frontend apps
Ans. 
Securing frontend apps involves implementing security measures to protect against common vulnerabilities.
• Use HTTPS to encrypt data transmitted between the frontend and backend

• Implement input validation to prevent injection attacks

• Avoid storing sensitive information in local storage

• Use Content Security Policy (CSP) to prevent cross-site scripting (XSS) attacks
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Q1. Java script questions with example
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Q2. React native architecture
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Q1. Coding problem based on string manipulation
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Q2. React native questions
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Q1. Most Frequent Element of Array.
Ans. 
Find the most frequent element in an array of strings.
• Create an object to store the frequency of each element in the array.

• Iterate through the array and update the frequency count in the object.

• Find the element with the highest frequency in the object.
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Q2. Unique elements out of array
Ans. 
Return unique elements from an array of strings
• Use Set to store unique elements

• Convert array to Set and then back to array to get unique elements

• Example: ['apple', 'banana', 'apple', 'orange'] should return ['apple', 'banana', 'orange']
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Q3. Closures in the JavaScript
Ans. 
Closures in JavaScript allow functions to access variables from an outer function even after the outer function has finished executing.
• Closures are created when a function is defined within another function and the inner function references variables from the outer function.

• Closures have access to the outer function's scope chain, allowing them to access variables even after the outer function has returned.

• Closures are...read more
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Q1. Angular basics questions
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Moderate level coding question