Nice solution! Clear and clever.

Could you explain how this is work?

thanks :)

... is the spread operator(Spread syntax MDN article). You should google it to learn more.

can i ask a question, i dont understend the three dots before list, can you tell what are those. thanks

No, don't use this, this is totally wrong and the worst practice for shuffling:

https://bost.ocks.org/mike/shuffle/compare.html
http://www.robweir.com/blog/2010/02/microsoft-random-browser-ballot.html

The best practice: use Fisher-Yates/Knugh algorithm instead.

(I'm going to repost this to every top solution here that uses random comparator because this is important)

Works for me

This is another example of code that doesn't appear to be passing when pasted exactly as is into codewars for this kata.