filter duplicate objects from (small) arrays using a key

filter_duplicate_objs.js

function filterDuplicates(arr,key) {
  const set = new Set(arr.map(x=>x[key]))
  const newArray = []
  while (set.size > 0) {
    const item = arr.filter(x => set.has(x[key]))[0]
    set.delete(item[key])
    newArray.push(item)
  }
  return newArray
}
/// const arr = [{id:1},{id:1},{id:2}]
/// filterDuplicates(arr,'id')