March 2014 update

Task/Sort-using-a-custom-comparator/Objective-C/sort-using-a-custom-comparator-1.m

@@ -4,25 +4,25 @@
 
 int main()
 {
-  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
+  @autoreleasepool {
 
-  NSMutableArray *arr =
-  [NSMutableArray
-    arrayWithArray: [@"this is a set of strings to sort"
-                     componentsSeparatedByString: @" "]
-   ];
+    NSMutableArray *arr =
+    [NSMutableArray
+      arrayWithArray: [@"this is a set of strings to sort"
+                       componentsSeparatedByString: @" "]
+     ];
 
-  [arr sortUsingComparator: ^NSComparisonResult(id obj1, id obj2){
-    NSComparisonResult l = esign((int)([obj1 length] - [obj2 length]));
-    return l ? -l // reverse the ordering
-             : [obj1 caseInsensitiveCompare: obj2];
-   }];
+    [arr sortUsingComparator: ^NSComparisonResult(id obj1, id obj2){
+      NSComparisonResult l = esign((int)([obj1 length] - [obj2 length]));
+      return l ? -l // reverse the ordering
+               : [obj1 caseInsensitiveCompare: obj2];
+     }];
+
+    for( NSString *str in arr )
+    {
+      NSLog(@"%@", str);
+    }
 
-  for( NSString *str in arr )
-  {
-    NSLog(@"%@", str);
   }
-
-  [pool release];
   return EXIT_SUCCESS;
 }

Task/Sort-using-a-custom-comparator/Objective-C/sort-using-a-custom-comparator-2.m

@@ -16,23 +16,21 @@
 
 int main()
 {
-  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
+  @autoreleasepool {
 
-  NSMutableArray *arr =
-     [NSMutableArray
-       arrayWithArray: [@"this is a set of strings to sort"
-                         componentsSeparatedByString: @" "]
-     ];
+    NSMutableArray *arr =
+       [NSMutableArray
+         arrayWithArray: [@"this is a set of strings to sort"
+                           componentsSeparatedByString: @" "]
+       ];
 
-  [arr sortUsingSelector: @selector(my_compare:)];
+    [arr sortUsingSelector: @selector(my_compare:)];
+
+    for ( NSString *str in arr )
+    {
+      NSLog(@"%@", str);
+    }
 
-  NSEnumerator *iter = [arr objectEnumerator];
-  NSString *str;
-  while( (str = [iter nextObject]) != nil )
-  {
-    NSLog(@"%@", str);
   }
-
-  [pool release];
   return EXIT_SUCCESS;
 }

Task/Sort-using-a-custom-comparator/Objective-C/sort-using-a-custom-comparator-3.m

@@ -2,21 +2,17 @@
 
 int main()
 {
-  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
+  @autoreleasepool {
 
-  NSArray *strings = [@"Here are some sample strings to be sorted" componentsSeparatedByString:@" "];
+    NSArray *strings = [@"Here are some sample strings to be sorted" componentsSeparatedByString:@" "];
 
-  NSSortDescriptor *sd1 = [[NSSortDescriptor alloc] initWithKey:@"length" ascending:NO];
-  NSSortDescriptor *sd2 = [[NSSortDescriptor alloc] initWithKey:@"lowercaseString" ascending:YES];
+    NSSortDescriptor *sd1 = [[NSSortDescriptor alloc] initWithKey:@"length" ascending:NO];
+    NSSortDescriptor *sd2 = [[NSSortDescriptor alloc] initWithKey:@"lowercaseString" ascending:YES];
 
-  NSArray *sortDescriptors = [NSArray arrayWithObjects:sd1, sd2, nil];
-  [sd1 release];
-  [sd2 release];
+    NSArray *sorted = [strings sortedArrayUsingDescriptors:@[sd1, sd2]];
+    NSLog(@"%@", sorted);
 
-  NSArray *sorted = [strings sortedArrayUsingDescriptors:sortDescriptors];
-  NSLog(@"%@", sorted);
-
-  [pool release];
+  }
 
   return 0;
 }