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# Sorts an array in ascending natural order using merge sort.
merge_sort = (list) ->
return list if list.length is 1
pivot = Math.floor list.length / 2
left = merge_sort list.slice 0, pivot
right = merge_sort list.slice pivot
result = while left.length and right.length
if left[0] < right[0] then left.shift() else right.shift()
result.concat(left).concat(right)
# Test the function.
console.log merge_sort([3, 2, 1]).join(' ') is '1 2 3'
console.log merge_sort([9, 2, 7, 0, 1]).join(' ') is '0 1 2 7 9'
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