FIS UI Developer Interview Questions and Answers

This is coding + mcq question

Q1. What is react class based conponent?
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Q2. What is mixins?
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Q3. What are react lifecycles?
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Q1. WHat is event loop?
Ans. 
Event loop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking way.
• Event loop is responsible for handling asynchronous operations in JavaScript.

• It allows for non-blocking execution of code by continuously checking the call stack and the task queue.

• When the call stack is empty, the event loop moves tasks from the task queue to the call stack for execution.

• Example: setTim...read more
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Q2. What is DOM ?
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DOM stands for Document Object Model, a programming interface for web documents.
• DOM is a tree-like structure that represents the elements of a web page.

• It allows developers to manipulate the content, structure, and style of a web page using scripting languages like JavaScript.

• DOM provides methods and properties to interact with HTML elements, such as selecting, adding, removing, or modifying them.

• Example: document.getE...read more
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Q1. Salary disccosion only
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Q1. What is lazy loading? What is routing and how to implement it? How to implement observables? What is promise? How to achieve asynchronous call in javascript?
Ans. 
Lazy loading is a technique to defer loading of non-critical resources until they are needed.
• Lazy loading improves page load time and performance.

• It is commonly used for images, videos, and other media files.

• Lazy loading can be implemented using JavaScript libraries like LazyLoad or by using the Intersection Observer API.

• Lazy loading can also be implemented in frameworks like Angular and React.
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Q2. What is HTML5? What is css3? How to achieve media queries?
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HTML5 is the latest version of the HTML standard, CSS3 is the latest version of the CSS standard, and media queries are used in CSS to apply different styles based on device characteristics.
• HTML5 is the fifth and latest version of the HTML standard used for structuring content on the web.

• CSS3 is the latest version of the CSS standard used for styling web pages.

• Media queries in CSS allow for responsive design by applyin...read more
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Q1. For loop fine the array value
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Using a for loop to find a specific value in an array of strings.
• Use a for loop to iterate through the array

• Check each element to see if it matches the desired value

• Return the index of the matching element or -1 if not found
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Q2. For loop fine the array valu
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To find array values using for loop
• Declare a variable to store the sum of array values

• Use a for loop to iterate through the array

• Access each element using array[index] syntax

• Add the element value to the sum variable

• Return the sum variable
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