Using and not using the @property in ios

Can someone help me understand what variable and method calls look like when we are discussing using an @property and when we are just using a plain old variable?

For example. if i have an array that i didn't make a property, how would I call it if i made
...
{
NSMutableArray *myArray;
}

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and how would I access it with correct syntax if I had made it a property?

@property (weak, nonatomic) NSMutableArray *myArray;

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can you give me an example to of the difference in calling a string or int or something:

@property (weak, nonatomic) NSString *myString;

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vs  

{
     NSString *myString;
}

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Mark_CoAsked:
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pgnatyukCommented:
Always use properties.

Just in case with NSString declare it as
@property (copy) NSString *myString;
(or @property (copy, nonatomic) NSString *myString;)

If you have an object:
@property (strong) NSObject *myObject;

If it's about an integer (float, BOOL, etc.)
@property (assign) NSInteger myInt;

This answer is too short. The long one you can find in a book - I'd recommend this way.
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