unique.js

var unique = function(array) {
  var pushed = {}, output = []
  for (n in array) {
    var value = array[n]
    if ( !pushed[value] ) {
      output.push(value)
      pushed[value] = true
    }
  }
  return output
}

unique(['stu', 'stu', 'stu', 'lol', 'fart', 'poop', 'poop']) // returns ['stu', 'lol', 'fart', 'poop']