I found now but did find a thread on StackOverflow with a workable solution. It works by filtering for those cells who are the first occurence of their value in the array. THis works great for ‘exact’ matches, so be wary for strings where the content ‘uniqueness’ might ignore casing.
const onlyUnique = (value, index, self) => self.indexOf(value) === index;
const array = [1,2,1,3,4,3,5];