javascript, unique, uniq, filtering

unique

function unique(in_list) {
  var lookup = {};
  var values = [];
  for (var i = 0; i < in_list.length; i++) {
    if (!lookup[in_list[i]]) {
      values.push(in_list[i]);
    }
    lookup[in_list[i]] = true;
  }
  return values;
};

console.log(unique([1, 4, 1, 2, 3, 4, 3, 2])); //->  [1, 4, 2, 3 ]

 Note: Not really suites for big arrays.