Updated radixSort argument to swift3 syntax.

Author: taiheng

Radix Sort/radixSort.swift

@@ -5,43 +5,42 @@
 */
 
 
-func radixSort(inout arr: [Int] ) {
-
-
+// NOTE: This implementation does not handle negative numbers
+func radixSort(_ array: inout [Int] ) {
  let radix = 10 //Here we define our radix to be 10
  var done = false
  var index: Int
  var digit = 1 //Which digit are we on?
-
-
+ 
+ 
  while !done { //While our sorting is not completed
  done = true //Assume it is done for now
-
+ 
  var buckets: [[Int]] = [] //Our sorting subroutine is bucket sort, so let us predefine our buckets
-
+ 
  for _ in 1...radix {
  buckets.append([])
  }
-
-
- for number in arr {
+ 
+ 
+ for number in array {
  index = number / digit //Which bucket will we access?
  buckets[index % radix].append(number)
  if done && index > 0 { //If we arent done, continue to finish, otherwise we are done
  done = false
  }
  }
-
+ 
  var i = 0
-
+ 
  for j in 0..<radix {
  let bucket = buckets[j]
  for number in bucket {
- arr[i] = number
+ array[i] = number
  i += 1
  }
  }
-
+ 
  digit *= radix //Move to the next digit
  }
 }