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Reversing a NSString Objective-C

suggest change 
// myString is "hi"
NSMutableString *reversedString = [NSMutableString string];
NSInteger charIndex = [myString length];
while (charIndex > 0) {
    charIndex--;
    NSRange subStrRange = NSMakeRange(charIndex, 1);
    [reversedString appendString:[myString substringWithRange:subStrRange]];
}
NSLog(@"%@", reversedString); // outputs "ih"
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NSString:
* NSString
* Encoding and Decoding
* String Length
* Splitting
* Comparing Strings
* Creation
* Searching for a Substring
* Changing Case
* Joining an Array of Strings
* Removing Leading and Trailing Whitespace
* Formatting
* Working with C Strings
* Reversing a NSString Objective-C
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