diff --git a/.travis.yml b/.travis.yml
index 765f07786..80ced8b6c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,6 +33,7 @@ script:
 # - xcodebuild test -project ./Priority\ Queue/Tests/Tests.xcodeproj -scheme Tests
 - xcodebuild test -project ./Queue/Tests/Tests.xcodeproj -scheme Tests
 # - xcodebuild test -project ./Quicksort/Tests/Tests.xcodeproj -scheme Tests
+- xcodebuild test -project ./Radix\ Sort/Tests/Tests.xcodeproj -scheme Tests
 - xcodebuild test -project ./Rootish\ Array\ Stack/Tests/Tests.xcodeproj -scheme Tests
 # - xcodebuild test -project ./Run-Length\ Encoding/Tests/Tests.xcodeproj -scheme Tests
 # - xcodebuild test -project ./Select\ Minimum\ Maximum/Tests/Tests.xcodeproj -scheme Tests
diff --git a/Radix Sort/RadixSort.playground/Contents.swift b/Radix Sort/RadixSort.playground/Contents.swift
new file mode 100644
index 000000000..a4f7e3527
--- /dev/null
+++ b/Radix Sort/RadixSort.playground/Contents.swift	
@@ -0,0 +1,16 @@
+//: Playground - noun: a place where people can play
+
+import Cocoa
+
+// Test Radix Sort with small array of ten values
+var array: [Int] = [19, 4242, 2, 9, 912, 101, 55, 67, 89, 32]
+radixSort(&array)
+
+// Test Radix Sort with large array of 1000 random values
+var bigArray = [Int](repeating: 0, count: 1000)
+var i = 0
+while i < 1000 {
+  bigArray[i] = Int(arc4random_uniform(1000) + 1)
+  i += 1
+}
+radixSort(&bigArray)
diff --git a/Radix Sort/RadixSort.playground/Sources/radixSort.swift b/Radix Sort/RadixSort.playground/Sources/radixSort.swift
new file mode 100644
index 000000000..136ede4fd
--- /dev/null
+++ b/Radix Sort/RadixSort.playground/Sources/radixSort.swift	
@@ -0,0 +1,46 @@
+/*
+ 
+ Sorting Algorithm that sorts an input array of integers digit by digit.
+ 
+ */
+import Foundation
+
+// NOTE: This implementation does not handle negative numbers
+public 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 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 {
+        array[i] = number
+        i += 1
+      }
+    }
+    
+    digit *= radix  //Move to the next digit
+  }
+}
diff --git a/Radix Sort/RadixSort.playground/contents.xcplayground b/Radix Sort/RadixSort.playground/contents.xcplayground
new file mode 100644
index 000000000..63b6dd8df
--- /dev/null
+++ b/Radix Sort/RadixSort.playground/contents.xcplayground	
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='macos'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>
\ No newline at end of file
diff --git a/Radix Sort/RadixSort.playground/playground.xcworkspace/contents.xcworkspacedata b/Radix Sort/RadixSort.playground/playground.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 000000000..919434a62
--- /dev/null
+++ b/Radix Sort/RadixSort.playground/playground.xcworkspace/contents.xcworkspacedata	
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/Radix Sort/Tests/Info.plist b/Radix Sort/Tests/Info.plist
new file mode 100644
index 000000000..6c6c23c43
--- /dev/null
+++ b/Radix Sort/Tests/Info.plist	
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>
diff --git a/Radix Sort/Tests/RadixSortTests.swift b/Radix Sort/Tests/RadixSortTests.swift
new file mode 100644
index 000000000..688bcdcb8
--- /dev/null
+++ b/Radix Sort/Tests/RadixSortTests.swift	
@@ -0,0 +1,18 @@
+//
+//  RadixSortTests.swift
+//  Tests
+//
+//  Created by theng on 2017-01-10.
+//  Copyright © 2017 Swift Algorithm Club. All rights reserved.
+//
+
+import XCTest
+
+class RadixSortTests: XCTestCase {
+  func testCombSort() {
+    let expectedSequence: [Int] = [2, 9, 19, 32, 55, 67, 89, 101, 912, 4242]
+    var sequence = [19, 4242, 2, 9, 912, 101, 55, 67, 89, 32]
+    radixSort(&sequence)
+    XCTAssertEqual(sequence, expectedSequence)
+  }
+}
diff --git a/Radix Sort/Tests/Tests.xcodeproj/project.pbxproj b/Radix Sort/Tests/Tests.xcodeproj/project.pbxproj
new file mode 100644
index 000000000..4b32f71b5
--- /dev/null
+++ b/Radix Sort/Tests/Tests.xcodeproj/project.pbxproj	
@@ -0,0 +1,277 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 46;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		056E92AB1E25D0C700B30F52 /* RadixSortTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 056E92AA1E25D0C700B30F52 /* RadixSortTests.swift */; };
+		056E92AF1E25D3D700B30F52 /* radixSort.swift in Sources */ = {isa = PBXBuildFile; fileRef = 056E92AE1E25D3D700B30F52 /* radixSort.swift */; };
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+/* End PBXFileReference section */
+
+/* Begin PBXFrameworksBuildPhase section */
+		056E929F1E25D04D00B30F52 /* Frameworks */ = {
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+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		056E92851E25D03300B30F52 = {
+			isa = PBXGroup;
+			children = (
+				056E92A31E25D04D00B30F52 /* Tests */,
+				056E928F1E25D03300B30F52 /* Products */,
+			);
+			sourceTree = "<group>";
+		};
+		056E928F1E25D03300B30F52 /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				056E92A21E25D04D00B30F52 /* Tests.xctest */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+		056E92A31E25D04D00B30F52 /* Tests */ = {
+			isa = PBXGroup;
+			children = (
+				056E92AE1E25D3D700B30F52 /* radixSort.swift */,
+				056E92A61E25D04D00B30F52 /* Info.plist */,
+				056E92AA1E25D0C700B30F52 /* RadixSortTests.swift */,
+			);
+			name = Tests;
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+/* End PBXGroup section */
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+			buildPhases = (
+				056E929E1E25D04D00B30F52 /* Sources */,
+				056E929F1E25D04D00B30F52 /* Frameworks */,
+				056E92A01E25D04D00B30F52 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = Tests;
+			productName = Tests;
+			productReference = 056E92A21E25D04D00B30F52 /* Tests.xctest */;
+			productType = "com.apple.product-type.bundle.unit-test";
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+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		056E92861E25D03300B30F52 /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				LastSwiftUpdateCheck = 0820;
+				LastUpgradeCheck = 0820;
+				ORGANIZATIONNAME = "Swift Algorithm Club";
+				TargetAttributes = {
+					056E92A11E25D04D00B30F52 = {
+						CreatedOnToolsVersion = 8.2;
+						LastSwiftMigration = 0820;
+						ProvisioningStyle = Automatic;
+					};
+				};
+			};
+			buildConfigurationList = 056E92891E25D03300B30F52 /* Build configuration list for PBXProject "Tests" */;
+			compatibilityVersion = "Xcode 3.2";
+			developmentRegion = English;
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+			knownRegions = (
+				en,
+				Base,
+			);
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+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				056E92A11E25D04D00B30F52 /* Tests */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXResourcesBuildPhase section */
+		056E92A01E25D04D00B30F52 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXResourcesBuildPhase section */
+
+/* Begin PBXSourcesBuildPhase section */
+		056E929E1E25D04D00B30F52 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				056E92AF1E25D3D700B30F52 /* radixSort.swift in Sources */,
+				056E92AB1E25D0C700B30F52 /* RadixSortTests.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin XCBuildConfiguration section */
+		056E92991E25D03300B30F52 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				CODE_SIGN_IDENTITY = "-";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
+				MTL_ENABLE_DEBUG_INFO = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = macosx;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+			};
+			name = Debug;
+		};
+		056E929A1E25D03300B30F52 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				CODE_SIGN_IDENTITY = "-";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				MACOSX_DEPLOYMENT_TARGET = 10.12;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = macosx;
+				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+			};
+			name = Release;
+		};
+		056E92A81E25D04D00B30F52 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_ENABLE_MODULES = YES;
+				COMBINE_HIDPI_IMAGES = YES;
+				INFOPLIST_FILE = Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
+				PRODUCT_BUNDLE_IDENTIFIER = Swift.Algorithm.Club.Tests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 3.0;
+			};
+			name = Debug;
+		};
+		056E92A91E25D04D00B30F52 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_ENABLE_MODULES = YES;
+				COMBINE_HIDPI_IMAGES = YES;
+				INFOPLIST_FILE = Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
+				PRODUCT_BUNDLE_IDENTIFIER = Swift.Algorithm.Club.Tests;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 3.0;
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		056E92891E25D03300B30F52 /* Build configuration list for PBXProject "Tests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				056E92991E25D03300B30F52 /* Debug */,
+				056E929A1E25D03300B30F52 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		056E92A71E25D04D00B30F52 /* Build configuration list for PBXNativeTarget "Tests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				056E92A81E25D04D00B30F52 /* Debug */,
+				056E92A91E25D04D00B30F52 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 056E92861E25D03300B30F52 /* Project object */;
+}
diff --git a/Radix Sort/Tests/Tests.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/Radix Sort/Tests/Tests.xcodeproj/project.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 000000000..6c0ea8493
--- /dev/null
+++ b/Radix Sort/Tests/Tests.xcodeproj/project.xcworkspace/contents.xcworkspacedata	
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:Tests.xcodeproj">
+   </FileRef>
+</Workspace>
diff --git a/Radix Sort/Tests/Tests.xcodeproj/xcshareddata/xcschemes/Tests.xcscheme b/Radix Sort/Tests/Tests.xcodeproj/xcshareddata/xcschemes/Tests.xcscheme
new file mode 100644
index 000000000..b3f6d696a
--- /dev/null
+++ b/Radix Sort/Tests/Tests.xcodeproj/xcshareddata/xcschemes/Tests.xcscheme	
@@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0820"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "056E92A11E25D04D00B30F52"
+               BuildableName = "Tests.xctest"
+               BlueprintName = "Tests"
+               ReferencedContainer = "container:Tests.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "056E92A11E25D04D00B30F52"
+               BuildableName = "Tests.xctest"
+               BlueprintName = "Tests"
+               ReferencedContainer = "container:Tests.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+      <MacroExpansion>
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+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "056E92A11E25D04D00B30F52"
+            BuildableName = "Tests.xctest"
+            BlueprintName = "Tests"
+            ReferencedContainer = "container:Tests.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "056E92A11E25D04D00B30F52"
+            BuildableName = "Tests.xctest"
+            BlueprintName = "Tests"
+            ReferencedContainer = "container:Tests.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "056E92A11E25D04D00B30F52"
+            BuildableName = "Tests.xctest"
+            BlueprintName = "Tests"
+            ReferencedContainer = "container:Tests.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/Radix Sort/radixSort.swift b/Radix Sort/radixSort.swift
index 31a783db7..24d4155d7 100644
--- a/Radix Sort/radixSort.swift	
+++ b/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
   }
 }