I think the main idea of Pascal Triangle here is just to understand what is it and how to generate new lines, rest of the task is more related to your preferable programming language. I've heard about this triagnle before I started so it's not such a hard thing

sure, my bad 🤗

1. containsDuplicates method returns true or false, !! sign converts to boolean. So you don't need it in this case.
2. you make sort two times. If you will work with array with 1 000 000 000 items, this operation will really slow down your computer.

If you want to make your solution clearier, try to

1. sort keys
2. create new array
3. iterate over keys and push original array's items, like this arr.push(this[keys[i]])
4. return new array

JS version too simple and not related to 5kyu

just trying to solve task in one line

nice one!