Makes the fields and methods of an Object accessible via the $
operator. This method is never called explicitly, but through an indirect
usage of the $ operator, e.g. obj$name or
obj$getValue().
1) This method will first search for a get<Name>() method, e.g. if
name has the value "age", a getAge() will be looked for.
If such a method exists it will be called with the Object as the first
and only argument, e.g. getAge(this).
A get<Name>() is only looked for if <name> is not a private
field. A private field is a name beginning with a .
(period). The rational for this naming convention is to be consistent
with how ls() works, which will not list such members
by default.
2) If no such method exists, first then, this method will look a field in
the Object can has the name name.
3) If such neither exists, a method with name name will be
searched for and returned.
4) Otherwise, a static field will be looked for.
5) If no fields or methods are found at all, NULL is returned.
# S3 method for Object
$(this, name)
# S3 method for Object
[[(this, name, exact=TRUE)Returns the value of a field or a method (function).
If no such field or method exists, NULL is returned.
The name of the field or method to be accessed.
Henrik Bengtsson
For more information see Object.