RGBSI UI Developer Interview Questions and Answers

Q1. Reverse a String in Javascript
Ans. 
To reverse a string in Javascript, we can use the built-in reverse() method.
• Convert the string to an array using split() method

• Use the reverse() method to reverse the array

• Convert the reversed array back to a string using join() method
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Q1. Indroduction
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Hii

Q1. Question on javascript basics and some difficult programs which available online
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Q2. Question related to angular
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Q1. Difference between Var,let and const
Ans. 
Var is function scoped, let and const are block scoped. Var can be redeclared and reassigned, let can be reassigned but not redeclared, const cannot be reassigned or redeclared.
• Var is function scoped

• Let and const are block scoped

• Var can be redeclared and reassigned

• Let can be reassigned but not redeclared

• Const cannot be reassigned or redeclared
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Q2. New features in Angular 10
Ans. 
Angular 10 introduces new features like stricter types, optional strict mode, and performance improvements.
• Stricter types with TypeScript 3.9

• Optional strict mode for better type checking

• Improved build times and smaller bundle sizes

• Updated dependencies like TypeScript 3.9 and TSLib 2.0
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30 min,mathematics,general study

30 min, UI full stack developer

Q1. Given UI task display like display boxes side by side in desktop screen and one after the other in mobile screen using media queries?
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Q2. Explain difference between authorization vs authentication?
Ans. 
Authentication verifies a user's identity, while authorization determines what a user can access.
• Authentication confirms a user's identity through credentials like username and password.

• Authorization controls access to resources based on the authenticated user's permissions.

• Example: Logging into a website (authentication) and then being able to view/edit specific pages based on your role (authorization).
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Q3. How to render list in react? Also explain difference between state vs prop in react?
Ans. 
To render a list in React, use map() function to iterate over an array of data and return a list of components. State is mutable data managed within a component, while props are immutable data passed from parent to child components.
• To render a list in React, use map() function to iterate over an array of data and return a list of components.

• Example: const items = ['item1', 'item2', 'item3']; items.map(item =>

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Q1. What are the webpage optimization techniques? How to check webpage optimization? In lighthouse optimization reports , how to fix issue related render blocking scripts?
Ans. 
Webpage optimization techniques include minifying CSS and JS files, optimizing images, using asynchronous loading for scripts, and reducing render-blocking scripts.
• Minify CSS and JS files to reduce file sizes and improve loading times.

• Optimize images by compressing them and using the correct file format (e.g. JPEG for photographs, PNG for graphics).

• Use asynchronous loading for scripts to prevent them from blocking the ...read more
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Q2. Write scss code nested li element by applying background color 2 element and also use mixins?
Ans. 
Use SCSS to apply background color to nested li elements and utilize mixins.
• Use nesting to target the li elements within a parent element

• Apply background color to the 2nd li element using the :nth-child() selector

• Define and use mixins to reuse styles across the codebase
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Q3. How to fix cumulative layout shift issues?
Ans. 
To fix cumulative layout shift issues, ensure all images and media have dimensions specified in HTML, use CSS aspect ratio boxes, and prioritize loading critical resources.
• Specify dimensions for all images and media in HTML to prevent layout shifts.

• Use CSS aspect ratio boxes to reserve space for images before they load.

• Prioritize loading critical resources to avoid sudden layout changes.
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Q1. Ui development and component related
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Q2. Performance of technology and challenges
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Q1. Personal introduction and location details
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Q2. Negatition of salries excepectations
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