UBS Front end Developer Interview Questions and Answers

React js, mcq, and basic js program like prime factor, unsort array

Q1. 1. How to Unsort array
Ans. 
To unsort an array, you can shuffle its elements randomly.
• Use a random number generator to generate random indices within the array length.

• Swap the elements at the randomly generated indices.

• Repeat the swapping process for a sufficient number of times to achieve randomness.
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Q2. Write a code Prime factor
Ans. 
Prime factor code finds the prime factors of a given number.
• Start with the smallest prime factor, 2.

• Divide the number by the prime factor until it is no longer divisible.

• Move on to the next prime factor until the number is reduced to 1.

• Return the list of prime factors.
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Q1. Round 1 1.Basic JS question 2.Tricky indepth question who answer you would have to logically conclude/ educative guess Eg: 3. Why class are in React immutable but props mutable What happens to local sess...read more
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1.Complex coding round.
2.Explain any independent project you have done

Q1. Basic Javascript questions. Object, Arrow function.
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Round duration - 90 minutes
Round difficulty - Medium

There were 33 questions in total. The objective questions were simple.

Q1. 
Sort Big List Dates Problem Statement
Mary is an enthusiastic party-goer who struggles with remembering event dates. Help Mary by sorting a given list of event dates in an ascending order.
Example:
Inpu...read more
Ans. 
Sort a list of event dates in ascending order based on year, month, and day.
• Sort the list of dates based on year, then month, and finally day.

• Use a sorting algorithm to rearrange the dates in ascending order.

• Ensure the constraints are met for each date in the list.
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Q2. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
...read more
Ans. 
Given an array and a target sum, find all pairs of elements that add up to the target sum.
• Iterate through the array and for each element, check if the complement (target sum - current element) exists in a hash set.

• If the complement exists, add the pair to the result list.

• Sort the pairs based on the first element and then the second element.

• Handle edge cases like duplicate elements and pairs with the same values.

• Example...read more
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Q3. 
Maximum Sum Problem Statement
Given an integer N, your task is to recursively break it into three integer parts: N / 2, N / 3, and N / 4. You need to compute the maximum sum possible by dividing the numbe...read more
Ans. 
Given an integer N, recursively break it into three parts and find the maximum sum possible.
• Recursively divide N into N/2, N/3, and N/4 to find the maximum sum

• Compare the sum obtained by dividing N with the sum of N itself

• Return the maximum sum for each test case
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