I would appreciate help understanding the main differences between several types of functions in R.

I'm somewhat overwhelmed among the definitions of different types of functions and it has become somewhat difficult to understand how different types of functions might relate to each other.

Specifically, I'm confused about the relationships and differences between the following types of functions:

  1. Either Generic or Method: based on the class of the input argument(s), generic functions by using Method Dispatch call an appropriate method function.

  2. Invisible vs. Visible

  3. Primitive vs. Internal

I'm confused about how these different types of functions relate to each other (if at all) and what the various differences and overlaps are between them.

r function
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