Initial data commit

Task/Reverse-a-string/Objective-C/reverse-a-string-3.m

@@ -0,0 +1,20 @@
+#import <Foundation/Foundation.h>
+
+@interface NSString (Extended)
+-(NSString *)reverseString;
+@end
+
+@implementation NSString (Extended)
+-(NSString *)reverseString
+{
+	NSInteger l = [self length] - 1;
+	NSMutableString *ostr = [NSMutableString stringWithCapacity:[self length]];
+	while (l >= 0)
+	{
+		NSRange range = [self rangeOfComposedCharacterSequenceAtIndex:l];
+		[ostr appendString:[self substringWithRange:range]];
+		l -= range.length;
+	}
+	return ostr;
+}
+@end