SOURCE

function removeDuplicate(arr) {
  const newArr = []
  const obj = {}

  arr.forEach(item => {
    if (!obj[item]) {
      newArr.push(item)
      obj[item] = true
    }
  })

  return newArr
}
const results = removeDuplicate( [[2, 2], [2, 2]]);
console.log(results)