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mutableCopy和copy的区别

    // create an immutable array
        NSArray *arr = [NSArray arrayWithObjects: @"one", @"two", @"three", nil ];
        
        // create a mutable copy, and mutate it
        NSMutableArray *mut = [arr mutableCopy];

        [mut removeObject: @"one"];

        

        NSMutableArray *mut1 = [mut mutableCopy];
        [mut1 removeObjectAtIndex:0];
        
        NSMutableArray *mut2 = [NSMutableArray arrayWithObjects:@"A", @"B", nil];
        NSMutableArray *mut2_immut = [mut2 copy];
        //crash here
        //[myArray_immut removeObjectAtIndex:0];
        
        // Copys object, result is mutable
        NSMutableArray *mut2_mut = [mut2 mutableCopy];
        [mut2_mut removeObjectAtIndex:0];

mutableCopy和copy的区别