Yo, what do i have to learn to understand why str = "codewars", im talking serious!

If someone just add 10 more words, this doesn't seem very scalable.

I dont know if a failed but the random test for me is giving false as a different array but i copy and paste the random test in my code and try to see if they are different and they're completely the same array, so if you can check, maybe could be that im doing something wrong

oh, got it, thank you

Idk if im wrong, but in my machine its working, im using array.flat() but when i try to used it here it show me an error, is it allowed to use array.flat?

yes, it is normal, because its a cache

with cache into the filter function he is just asking

if cache[n] === undefined cache[n] will be 0, the first time

if cache[n] exist that means that you should increment +1

so the condition that he is returning is
if in my cache there is a number less than or equal to the argument x , return that

completely agree

this only iterates the array 3 times, and with that you can know if the number is even or odd and with the find it will only iterate until it finds it, when it finds it it will stop and so I will not have to iterate over the array in case it has 10000000000 elements and it is in a close position.