Celebal Technologies Reactjs Developer Interview Questions and Answers

20 Questions in CBT test you have to score minimum 60% than you passed

For React devloper they ask advanced java script and react advance logical coding

Q1. They say About here company policy and benefits
Add your answer

Q1. String based questions in java
Add your answer
Q2. What are the fundamental concepts of Java?
Add your answer

Java based questions and few DSA questions

Q1. Difference between hashset and hashtable
Ans. 
HashSet is an unordered collection of unique elements, while Hashtable is a synchronized collection of key/value pairs.
• HashSet does not allow duplicate elements, while Hashtable does not allow duplicate keys.

• HashSet does not maintain insertion order, while Hashtable does not guarantee any order.

• HashSet allows null values, while Hashtable does not allow null keys or values.
Answered by AI
Add your answer
Q2. Collection vs Collections
Ans. 
Collection is an interface in Java that represents a group of objects, while Collections is a utility class that contains static methods for operating on collections.
• Collection is an interface in Java that represents a group of objects.

• Collections is a utility class in Java that contains static methods for operating on collections.

• Example: List list = new ArrayList<>(); Collection collection = list;

• Example: Collections
Answered by AI
Add your answer

Q1. SQL query related questions
Add your answer
Q2. Write a Java program to find the duplicate in Array
Ans. 
Java program to find duplicates in an array of strings
• Create a HashSet to store unique elements

• Iterate through the array and check if element is already in the HashSet

• If element is already in the HashSet, it is a duplicate
Answered by AI
Add your answer

Basic DSA questions, best time to buy and sell stock and its variation

Q1. Basic nosql vs sql questions
Add your answer
Q2. Designing system for google playstore
Add your answer

1) Finding and removing loop in linked list. 2)find pair of given sum in binary tree

Q1. Print bottom view of binary tree
Ans. 
Print the bottom view of a binary tree
• Use a map to store the horizontal distance and node value at each level

• Perform a level order traversal of the binary tree

• Update the map with the node value at each horizontal distance

• Print the node values in the map for the bottom view
Answered by AI
Add your answer
Q2. Oops related output based questions
Add your answer

1st round is aptitude and pesudocode

Q1. Mostly python questions
Add your answer
Q2. List questions and basic to mediumprogram
Add your answer

In first round 4 coding question like 1 dsa 2 database and one is api and question is very simple . coding round was conducted in hackerrank

Q1. DSA QUESTION LIKE TREE AND GRAPH
Add your answer
Q2. DP AND SORTING APPROACH
Add your answer

Again same but dsa question and oops concept in deep level

Q1. Questions were completely based on data structures and algorithm
Add your answer
Q2. SQL based questions were also asked
Add your answer