Uniq implementation using Array.prototype.reduce

uniq.js

/* more functional version using concat */
function uniq(array) {
  return array.reduce(function(result, currentElement) {
    if (result.indexOf(currentElement) < 0) {
      return results.concat([currentElement]);
    }
    return result;
  }, []);
}

/* more traditional version using push */
function uniq2(array) {
  return array.reduce(function(result, currentElement) {
    if (result.indexOf(currentElement) < 0) {
      results.push(currentElement);
    }
    return result;
  }, []);
}

/* using array.filter */
function uniq3(array) {
  return array.filter(function (value, index, self) { 
    return self.indexOf(value) === index;
  });
}