array_uniq.coffee

Array::uniq = (cmp = null)->
  arr = this.slice(0)
  if typeof(cmp) == 'function'
    arr.sort(cmp)
  else
    arr.sort()
  i = 0 
  size = arr.length
  while i < size
    while true
      j = i + 1 
      break if arr[j] != arr[i] or not arr[j]?
      arr.splice(j, 1)

    i += 1

  arr 

# [ 1, 2, 3, 4, 5, 6 ]
array = [1, 1, 2, 2, 5, 2, 6, 5, 2, 2, 3, 2, 3, 4]
console.log array.uniq()