There are five rounds of interviews in which: 1. Aptitude 2. Coding 3. Coding + Technical Discussion 4. Coding + Technical Discussion 5. HR round I found the fourth round with TL was very messy, they want me to write a code on their owns conditions, which seems to be very brain-teasing for me. Except I tried GPT after that and I could not solve it. I Beleive that my whole round was smooth and I just didn't answer or like didn't covered their cases, and boom verdict is i am rejected. let arr = ['1', '2', '4', '80'] output = 12480 write a function that gives the above output but the trap is without using join and concat even if you can not use "+". These are such unique questions that we get to face in a decade. Apart from that i have written the rest API to fetch all the orders from a single product. Explained the event loop, covering MicroTask Queue.