Pattem Digital Technologies Javascript Developer Interview Questions and Answers

2 Leetcode Medium questions on hackerrank

Q1. Kadane algorithm based question
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Q2. Leetcode medium
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Q3. Resume based questions
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Q1. Probability question math problem
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Q2. Puzzle to solve
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Q3. AI based question
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Q4. 1 question to solve Leetcode medium
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Q1. Pointless basic questions is what they asked
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Q1. They had this round for hours together
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Q1. Mimic Dataframe Merge
Ans. 
Implement a function to mimic the functionality of merging two DataFrames in Python.
• Create a function that takes two DataFrames as input.

• Merge the two DataFrames based on a common column or index.

• Handle different types of joins like inner, outer, left, and right joins.

• Return the merged DataFrame as output.
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Q2. Improve above case by case
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1 hour - Find longest palindromic substring

60 Minutes coding test was there

Q1. Worst experience ever, never apply for company in this, highly unstable company
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Q2. Add two numbers in a linked list, don't apply
Ans. 
Traverse the linked list and add the values of each node without using additional data structures.
• Traverse the linked list while keeping track of the sum in a variable

• Update the sum by adding the value of each node as you traverse the list

• Handle carry over if the sum of two nodes is greater than 9
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Q3. Sort the array by using all sorting algorithms, don't join
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Q4. Subset problem find all the subsets
Ans. 
To find all subsets of a given set, use recursion to generate all possible combinations.
• Use recursion to generate all possible combinations of including or excluding each element in the set.

• Start with an empty subset and recursively add each element to create new subsets.

• Each subset can be represented as an array of strings.
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Q5. LRU Cache problem, explain it and implement it
Ans. 
LRU Cache is a data structure that stores a fixed number of items and removes the least recently used item when the cache is full.
• LRU Cache uses a combination of a doubly linked list and a hashmap to efficiently store and retrieve items.

• When an item is accessed, it is moved to the front of the linked list to indicate it is the most recently used item.

• If the cache is full, the least recently used item at the end of the ...read more
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Q1. 2 rounds, 2 coding questions in each round. Managerial round.
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It was 30min tests including 15 multiple choice and 5 coding questions on Java and Automation

Q1. What is Sanity Testing what is robot class how to switch between windows assertion and types what is iframe how to handle popups keyboard actions
Ans. 
Sanity testing is a subset of regression testing that focuses on testing the most crucial functionalities of a software application.
• Sanity testing is a quick and shallow testing of the main functionalities of an application to ensure it is stable enough for further testing.

• It is usually performed after major changes in the codebase to check if the core features are working as expected.

• Sanity testing is not exhaustive a...read more
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General Aptitude questions, Logical Reasoning ,Data Structures and Networking

Q1. Basic Coding questions and general OOPS Concepts
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Q1. Explaining Several Concepts about java and some SQL queries and Concepts of networking
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Q1. General Discussion about Yourself and The Company
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