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To concatenate two strings into a new string:

NSString *string1 = @"This is";
NSString *string2 = @" a test.";
NSString *string3 = [string1 stringByAppendingString:string2];
// string3 is now @"This is a test."  string1 and string2 are unchanged.

You can also assign the new string back to string1:

NSString *string1 = @"This is";
NSString *string2 = @" a test.";
string1 = [string1 stringByAppendingString:string2];
// string1 is now @"This is a test."

If you're using a NSMutableString, you can simply call the appendString method:

NSMutableString *string1 = [NSMutableString stringWithString:@"This is"];
NSString *string2 = @" a test.";
[string1 appendString:string2];
NSLog(@"string1: %@", string1);         // string1 is now @"This is a test."

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