NSString property: copy or retain?

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Let’s say I have a class called SomeClass with a string property name:

@interface SomeClass : NSObject
{
    NSString* name;
}

@property (nonatomic, retain) NSString* name;

@end

I understand that name may be assigned a NSMutableString in which case this may lead to errant behavior.

  • For strings in general, is it always a good idea to use the copy attribute instead of retain?
  • Is a “copied” property in any way less efficient than such a “retain-ed” property?

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