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For example, I need to append a word to an existing string.
NSString * temp = @"some prefix";
someString = [temp stringByAppendString: someString];
Should I release the object temp?
No, you shouldn’t as you didn’t increase retain count of @”some text”.
PS: Actually, all @”…” constants have retainCount on MAX_INT, so it doesn’t matter if you release them or not :).