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Event Loop in Node.js is a mechanism that allows Node.js to perform non-blocking I/O operations.
Event Loop is responsible for handling asynchronous operations in Node.js.
It allows Node.js to perform multiple operations simultaneously without blocking the execution.
Event Loop continuously checks the event queue for any pending tasks and executes them in a loop.
Example: setTimeout() function in Node.js uses Event Loop to...
4 coding question 1 easy 2 medium 1 hard
SQL query to find the second largest salary in a table
Use the MAX() function to find the highest salary
Use the WHERE clause to exclude the highest salary
Order the salaries in descending order and limit the result to 1
Frond end related coding
Core js and next interview
Gammastack interview questions for designations
I was interviewed before Feb 2023.
I applied via Referral and was interviewed before Mar 2023. There were 3 interview rounds.
3 coding program for campus drive selection
Top trending discussions
I was interviewed before Feb 2024.
There were two coding questions; one was related to linked lists, and the other was linked to binary trees.
Developed a web application for tracking inventory and sales data
Used React for front-end development
Implemented RESTful APIs using Node.js and Express for back-end
Utilized MongoDB for database management
Integrated authentication and authorization features for secure access
Implemented data visualization using Chart.js
Reversing a linked list involves changing the direction of pointers to go from the end to the beginning.
Start by initializing three pointers: current, previous, and next.
Iterate through the linked list, updating the pointers to reverse the direction of the links.
Update the head of the linked list to point to the new first node, which was the original last node.
Program to find perfect squares between two numbers
Iterate through numbers between the given range
Check if the square root of the number is an integer
If yes, then it is a perfect square
Smart pointers in C++ are objects that act like pointers but provide automatic memory management.
Smart pointers help prevent memory leaks by automatically managing memory allocation and deallocation.
Examples include unique_ptr, shared_ptr, and weak_ptr.
unique_ptr is used for exclusive ownership, shared_ptr for shared ownership, and weak_ptr to prevent circular references.
Mutual exclusion is a concept in concurrent programming where only one thread can access a shared resource at a time.
Ensures that only one thread can access a critical section of code at a time
Prevents race conditions and data corruption
Commonly implemented using locks, semaphores, or mutexes
Example: Using a mutex to protect a shared variable in a multi-threaded application
Implementing multithreading involves creating and managing multiple threads to execute tasks concurrently.
Identify the tasks that can be executed concurrently
Create and manage multiple threads to execute these tasks simultaneously
Use synchronization techniques like locks and semaphores to prevent race conditions
Handle communication and coordination between threads
Consider thread safety and resource sharing issues
Three coding online assessments - screening round.
Two to three coding questions based on dynamic programming.
Search for a target value in a 2D matrix efficiently.
Use binary search on rows to find the potential row where the target value may exist.
Then use binary search on that row to find the target value.
Find quadraplets in an array that sum up to a target value.
Use a nested loop to iterate through all possible combinations of quadraplets.
Keep track of the sum of each quadraplet and compare it to the target value.
Return the quadraplets that match the target sum.
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