GoComet Front end Developer Interview Questions and Answers

Q1. How to detect and prevent Memory leak
Ans. 
Memory leaks can be detected and prevented by monitoring memory usage, using memory profiling tools, avoiding circular references, and properly managing event listeners.
• Monitor memory usage regularly to identify any abnormal increases.

• Use memory profiling tools like Chrome DevTools or Valgrind to analyze memory usage.

• Avoid creating circular references in your code, as they can prevent objects from being garbage collect...read more
Answered by AI
Add your answer

Q1. Advanced JS questions
Add your answer

Q1. Find the longest sequence of numbers that are in ascending order.
Ans. 
Find the longest sequence of ascending numbers in an array.
• Iterate through the array and keep track of the current sequence length

• Reset the sequence length when a number is not in ascending order

• Return the longest sequence found
Answered by AI
Add your answer
Q2. Give a list of numbers and a target. You need to find the pair of numbers, whose value will be equal to target when we subtract
Ans. 
Find a pair of numbers in a list that subtract to a target value
• Iterate through the list of numbers and store each number in a hashmap along with its index

• For each number, check if the difference between the target and the number exists in the hashmap

• Return the pair of numbers if found, otherwise return an empty array
Answered by AI
Add your answer

Q1. Given a json, asked to make it a proper json
Add your answer
Q2. Asked to write a code for mean, median and sum of values of all unique items in the json.
Add your answer

Standard dsa questions, easy to medium

Aptitude questions with some basic coding questions

They have given 3 coding questions and some pseudo codings

Q1. Tell about your self
Add your answer
Q2. Some coding questions
Add your answer

70 questions in 90 minutes with 7 sections

Q1. Introduce yourself
Add your answer
Q2. Project description
Ans. 
Developed a web application for tracking project progress and managing tasks
• Used React.js for front-end development

• Implemented RESTful APIs using Node.js and Express for back-end

• Utilized MongoDB for database storage

• Incorporated authentication and authorization features for user security
Answered by AI
Add your answer
Q3. Second highest salary
Ans. 
To find the second highest salary in a table, you can use a SQL query with the MAX() function and a subquery.
• Use a SQL query to select the MAX() salary from the table.

• Use a subquery to select the MAX() salary that is less than the overall MAX() salary.

• Combine both queries to get the second highest salary.
Answered by AI
Add your answer
Q4. What is indexing
Ans. 
Indexing is a technique used to optimize the performance of databases by creating a data structure that allows for quick retrieval of data.
• Indexing involves creating a data structure that maps the values of specific columns in a database table to their physical location on disk.

• It helps in speeding up data retrieval operations by allowing the database to quickly locate the rows that match a certain condition.

• Examples o...read more
Answered by AI
Add your answer

Q1. Introduce yourself
Ans. 
I am a passionate software developer with experience in Java, Python, and web development.
• Experienced in Java, Python, and web development technologies

• Strong problem-solving skills

• Team player with excellent communication skills
Answered by AI
Add your answer
Q2. Project description
Ans. 
Developed a web application for tracking project progress and managing tasks
• Used React.js for front-end development

• Implemented RESTful APIs using Node.js and Express for back-end

• Utilized MongoDB for database storage

• Incorporated authentication and authorization features for user security
Answered by AI
Add your answer
Q3. Difference between truncate and delete
Ans. 
Truncate is a DDL command that removes all records from a table, while delete is a DML command that removes specific records.
• Truncate is faster than delete as it does not log individual row deletions.

• Truncate resets the identity seed of the table, while delete does not.

• Truncate cannot be rolled back, while delete can be rolled back using a transaction.

• Truncate does not fire triggers, while delete does.
Answered by AI
Add your answer

Q1. Why you join company
Add your answer
Q2. Where you see yourself after 5 years
Ans. 
In 5 years, I see myself as a senior software developer leading a team and working on cutting-edge technologies.
• Leading a team of developers on innovative projects

• Continuing to enhance my technical skills and knowledge

• Contributing to the growth and success of the company

• Possibly pursuing further education or certifications in software development
Answered by AI
Add your answer

Q1. Jump Game - II
Add your answer
Q2. Number of Island
Ans. 
Count the number of islands in a given grid of '1's and '0's.
• Iterate through the grid and for each '1' encountered, perform a depth-first search to mark all connected '1's as visited.

• Increment the island count for each new island encountered.

• Consider edge cases like grid boundaries and handling visited cells.
Answered by AI
Add your answer