They chat gpt'd it, that is where the map is coming from XD

only until you try to put that in TypeScript — https://www.typescriptlang.org/play?#code/GYVwdgxgLglg9mABACxgc2QQTAEwDJwDuAFGCALYBGApgE4DOAXIvVLTGGgJQDeAUIkQAbalEQBDWrUQBeRGSp16AOnoAHITCjEA5Ih1dEAeiPLy4tcQByFGrS4BuQQMS1RIWkgCy4qMjPiAB7EyqGS9ogA1Pox0T5+ZhwhYVKOfAC+QA — if you want to find a job, very likely it will be of writing TS, not JS

You need a an array or a string to use a for loop or I'm not understanding what you are implying.

Exactly, the 'and' parts are redundant due to the 'return' statements.

thx well explained!

The description seems pretty clear to me, what part aren't you understanding?

Your function gets a number, let's say 5
You need to convert it to a binary string, in this case it would be "101"
Then you need to return the amount of "1"s in that binary string, 2

That's it.