Status: Reject
YOE: 3+

1st Round (Screening)

This was their screening round, mostly question were from JS, after a breif Introduction

1. Write a function to flatten an array according to given depth

e.g

[[1,2,3],4,[[5,4,3]], [3,[4]]] => [1,2,3,4,[5,4,3], 3,[4]]

Completed in 10 mins using iterative method

2. Follow up: Put nested one in the end

eg.

[1,2,[3,4,[5,6]],7,8,[9]] => [1,2,7,8,9,3,4,9,[5,6]]

Again took 10 mins because got little diverted but then realized just using another array in the above will do it.

3. Array.isArray pollyfill

I suggested using Object.prototype.toString(obj) I foget to add a call there, interview was like don't come with hacks 🤔 and hinted towards class instance! answered after this hint, instanceOf even this is not reliable in case of Iframes!

4. Promise.race pollyfill => ansered in a minute!
5. Throttle pollyfill => ansered in a minute!
6. Cache function => ansered in a minute!
7. Asked me about the intersection observer, told the about the API and the use cases.
8. How to optimize images loading
   1. Use single image
   2. Use differnet image for different resoluation
   3. Lazy loading
9. How to lazy laod a image => Can be done using JS (intersection observer, scroll position etc.), I messed up littler here as I also said native HTML supports it using lazy load attribute (silly me)
10. Some CSS basic quesitons answered all.

I don't know what's their selection creteria or why they rejected me, HR ghosted me after this! I was able to answer pretty much everything fast as even I take take interview weekly and these things remain on my finger tips + Leetcode 300+ questions solved.