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]

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