Calling ggproto methods ggproto methods can take an optional
self argument: if it is present,
it is a regular method; if it's absent, it's a "static" method (i.e. it
doesn't use any fields). Imagine you have a ggproto object
Adder, which has a
addx = function(self, n) n + self$x. Then, to call this
function, you would use
Adder$addx(10) -- the
self is passed
in automatically by the wrapper function.
self be located anywhere
in the function signature, although customarily it comes first.
Calling methods in a parent To explicitly call a methods in a parent, use