Array.range generator

Here comes a simple little function that can help you to build range-arrays (useful if you use a functional coding-style)

Array.range = function(start, end){

  if(typeof start != "number") return []

  var hasEnd = typeof end == "number"
    , leftToRight
    , result = []

  end = hasEnd ? end : start
  start = hasEnd ? start : 0
  leftToRight = start < end

  if(leftToRight) for(;start <= end; start++) result.push(start)
  else for(;start >= end; start--) result.push(start)

  return result
}


Array.range(3,10) //  [3, 4, 5, 6, 7, 8, 9, 10]
Array.range(10, 3) // [10, 9, 8, 7, 6, 5, 4, 3]
Array.range(10) // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]