Wellness Forever Medicare Mern Full Stack Developer Interview Questions and Answers

Round duration - 60 Minutes
Round difficulty - Medium

Explain Higher Order Functions in javascript.
What is the difference between tag and tag?

Q1. Sort Array Of Strings
You are given an array of strings 'ARRSTR[]' of size 'N' and a character 'C'. Your task is to sort the 'ARRSTR[]' according to the new alphabetical ord...read more
Ans. HashMap Approach
Approach: The idea here is to use a data structure HashMap to store each character’s order in the new alphabetical order, starting with a letter c (given in the problem). Now, start comparing the strings in the ‘ARRSTR[]’ using HashMap that has been created to define the order.
 
Suppose that we are comparing two strings of ‘ARRSTR[]’ named ‘X’ and ‘Y’. Let us assume that we have found the first diff...read more
Answered by CodingNinjas
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Round duration - 60 minutes
Round difficulty - Medium

List the different types of relationships in SQL.
What is an Alias in SQL?

Q1. Relative Sorting
Given two arrays ‘ARR’ and ‘BRR’ of size ‘N’ and ‘M’ respectively. Your task is to sort the elements of ‘ARR’ in such a way that the relative order among the elements will be the same as t...read more
Ans. Brute Force
1. The idea is to maintain a visited array of size N.
2. Now, look for all occurrences of BRR elements one by one in ARR and mark them as visited and add them in ans array.
3. After performing the above operation. Insert all unvisited elements of ARR into a set, if any. So that they get arranged in a sorted manner.
4. And then finally insert elements of the set into our RES array.
Space Complexity: O(n)Explanation:
O(N), wh...read more
Answered by CodingNinjas
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Round duration - 60 Minutes
Round difficulty - Easy

Q1. Excel Sheet | Part-2
You are given a string STR representing the column title in an Excel Sheet. You need to find its corresponding column number.
For example: A corresponds to 1, B to 2, C to 3, … , Z t...read more
Ans. Optimal Solution
• The solution to this problem is like base 26 number conversion. Why 26? Because the number of capital english alphabets is 26.
• For example, while converting binary to decimal, we take base as 2 and then convert it to base 10. We would be doing the same thing here as well.
• To find the conversion, we would traverse through the given string from left to right, while calculating the answer.
• For every character...read more
Answered by CodingNinjas
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Round duration - 60 Minutes
Round difficulty - Easy

Q1. Basic HR Question
Why want to join lowes
Ans. 
Tip 1 : Polite
Tip 2 : Truth
Tip 3 : Simple
Answered by CodingNinjas
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