VectoScalar Technologies Private Limited React Js Frontend Developer Interview Questions and Answers

Q1. Clone a Todo Application UI using ReactJS, Sass
Ans. 
Clone a Todo Application UI using ReactJS, Sass
• Create a new ReactJS project using create-react-app

• Design the UI using Sass and implement it in ReactJS

• Use state and props to manage the todo list

• Add functionality to add, delete and mark tasks as complete

• Implement local storage to persist data

• Test the application thoroughly
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Q2. Explain the order of specifity in CSS classes, elements, ids, etc
Ans. 
Explanation of CSS specificity hierarchy
• Inline styles have the highest specificity

• IDs have higher specificity than classes and elements

• Multiple selectors with the same specificity are resolved by the order in which they appear in the stylesheet

• The universal selector (*) has the lowest specificity
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This round was more focused on the problem solving. 2 coding questions were asked. The round was for an hour

Q1. How does Server-Side Rendering work?
Ans. 
Server-Side Rendering (SSR) is the process of rendering web pages on the server and sending the HTML to the client.
• SSR improves website performance and SEO by reducing load times and providing search engines with fully rendered pages.

• React provides a library called ReactDOMServer that allows developers to render React components on the server.

• SSR requires a server-side framework or library, such as Next.js or Gatsby, t...read more
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Q1. What is the purpose of FLEX property in CSS Flexbox?
Ans. 
The purpose of the FLEX property in CSS Flexbox is to define how a flex item will grow or shrink to fit the available space.
• The FLEX property is used to set the initial size of a flex item.

• It can be used to specify how much a flex item can grow or shrink relative to the other flex items.

• The FLEX property is a shorthand for the FLEX-GROW, FLEX-SHRINK, and FLEX-BASIS properties.
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Q2. The flex property defines the ability of a flex item to grow ,shrink,,,,etc
Ans. 
The flex property defines the ability of a flex item to grow, shrink, or stay the same size.
• The flex property is a shorthand for flex-grow, flex-shrink, and flex-basis properties.

• It allows a flex item to grow or shrink to fill the available space.

• Values for flex property include a unitless number for flex-grow, a unitless number for flex-shrink, and a length or percentage for flex-basis.

• Example: flex: 1 1 50%;
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Quantitative aptitude, logical apptiude,

Q1. Data structure and algorithms
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Q2. Programming concepts
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It was js coding and react native related questions.

Q1. It was technical skills of Android and iOS application related react native
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Q1. It was discussed about your career and judge our professional career.
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Q1. Custom hook implementation
Ans. 
Custom hooks in React are reusable functions that contain logic shared between components.
• Custom hooks start with 'use' keyword (e.g. useState, useEffect)

• They can be used to share logic like fetching data, managing state, or subscribing to events

• Example: Custom hook for fetching data from an API can be used in multiple components
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Q1. Javascript basic questions, React Native interview questions
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Q1. ES6,filter,map,semantic elements, life cycle hooks of angular
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Q1. Closure, promises,observable,http interceptor , custom directive, box model
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Q1. It was more of discussion to get to know about organization
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Q1. Why are you looking for a change?
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Q2. What are your strengths and weaknesses?
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Q3. Tell me about yourself.
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Q1. How did you find out about us?
Ans. 
I found out about your company through a job search website.
• I was actively searching for UI Frontend Developer positions

• I came across your job posting on a popular job search website

• I researched your company and was impressed with your mission and values
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