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Method vs. Function invocation pattern

There is no difference between the person.calculateAge and person.greet as both will be added as a property to the 'person' object. However the author is trying to explain how the 'this' keyword is set during varying execution context which normally does not depend on where the function is defined, rather it depends on how a function is invoked.
In both the cases above the 'this' keyword will be set to 'person' object as these methods are being invoked by 'person'. However while invoking yearsOld() method it will no more point to 'person' object as it is being invoked by person.calculateAge.
I would recommend to take a look at Mozilla Dev link to understand 'this'.

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