KJ System UI Developer Interview Questions and Answers

Q1. Basic OOPs concept and coding
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Q1. Basic DSA question
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Q2. 1 mySql query to fetch records
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Q3. Design patterns
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Q1. Which data structure is used to reverse an array?
Ans. 
The data structure used to reverse an array is a stack.
• A stack data structure can be used to reverse an array by pushing each element onto the stack and then popping them off in reverse order.

• Example: If we have an array of strings ['apple', 'banana', 'cherry'], we can reverse it using a stack to get ['cherry', 'banana', 'apple'].
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Q1. Debouncing in react
Ans. 
Debouncing in React is a technique used to limit the number of times a function is called in a specified time frame.
• Debouncing helps in improving performance by reducing unnecessary function calls.

• It is commonly used in scenarios like search bars where we want to wait for user to finish typing before making an API call.

• Example: Using lodash debounce function to delay API call until user stops typing.
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Q2. Throttling in react
Ans. 
Throttling in React helps limit the number of times a function is called within a specified time frame.
• Throttling is used to improve performance by reducing the number of times a function is executed.

• It is commonly used in scenarios like handling scroll events or input changes.

• Example: Using lodash's throttle function to limit the rate of execution of a function.
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Basic in array and function and es6 concepts

Geomatry ,algebra ,train,

All people smile in my happy and etc .

Q1. Self introduction in my life
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Q2. My name is rajeshwari I am coming from kalugumalai currently I am staying in Chennai I completed in bsc computer science i family background is good
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Q3. Ambition my ambition is IT company recruitment
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Q4. Code full details tell me about
Ans. 
Code full details refer to providing a comprehensive explanation of a piece of code.
• Code full details involve explaining the purpose, functionality, and implementation of a specific code snippet.

• It includes discussing the variables, functions, logic, and overall structure of the code.

• Providing examples of input/output and expected behavior can help in explaining code full details.
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Q5. I am studying in web developement
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Q6. Work experience Mill work Forest work Marketing Online business
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Q1. Match box Mill work Forest work
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DSA, arrays, Graphs 3 rounds duration 1hr with mcqs

Advanced Graphs 2 questions mcqs 1hr

Q1. Java script and SQL
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Data structures and algorithms. can do in c++ or many other languages.

Q1. From gfg, simple array question. 3/5 difficultly.
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Q2. Based on resume. Discussion around that.
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Round duration - 65 Minutes
Round difficulty - Hard

There were 15 MCQS you have to do in 25 Minutes and 3 Coding questions you have to do in 40 minutes. They also give a demo test link to get you use to the environment.

Q1. Sliding Maximum
You are given an array 'ARR' of integers of length 'N' and a positive integer 'K'. You need to find the maximum elements for each and every contiguous subarray of s...read more
Ans. 
It was a standard problem so I know the exact solution, you can simply use dequeue + two pointers to solve this questions.
Answered by CodingNinjas
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Q2. Jump Game
You have been given an array 'ARR' of ‘N’ integers. You have to find the minimum number of jumps needed to reach the last index of the array i.e ‘N - 1’ if at any index ‘i’ we can jump to...read more
Ans. 
I did it by using DP, again it was a standard problem.
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Q3. Longest Palindromic Substring
You are given a string (STR) of length N.
Your task is to find the longest palindromic substring. If there is more than one palindromic substring with the maximum length, re...read more
Ans. 
I solve it by using dp in O(n^2) time complexity.
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Round duration - 180 Minutes
Round difficulty - Hard

It was more of Design + Data structure round. They give access to their server and ask us to do code there.

Q1. Design Question
They give a predefined file system project in which we have to write functionalities like to create/move/delete/copy a file. I have to use predefined classes to write my functionalities and ...read more
Ans. 
I made tree type data structure to build the file system but only able to write create and delete functionalities in the given time.
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