SOURCE

function uniqueArr(arr) {
  var temp = {};
  var result = [];
  for (var i = 0, j = arr.length; i < j; i++) {
    if (!temp[arr[i]]) {
      temp[arr[i]] = true;
      result.push(arr[i]);
    }
  }
  return result;
}
var testArr = [1, 1, 2, 2, 2, 3, 3, 5, 6, 1];
console.log(uniqueArr(testArr));


function delete_repeat(arr) {
    return [...new Set(arr)]
}
var arr = [1, 2, 3, 6, 2, 6, 5];
console.log(delete_repeat(arr));