mikmart/monad

Monad Operators and Generics

monad's Issues

Are there useful methods to be added for base classes?

list() comes to mind. Also possibly if you contort a bit you could see a NULL/default method as a kind of undeclared Maybe.

Should the generics use S3 instead of S7?

Some context here: armcn/maybe#10

I can't work out a simple way for an implementing package to register methods and to avoid a hard dependency on S7. With S3 the registrations would be trivial and only require Enhances: monad, e.g. with {maybe}:

#' @exportS3Method monad::fmap
fmap.maybe <- function(m, f, ...) {
  maybe_map(m, f, ...)
}

#' @exportS3Method monad::bind
bind.maybe <- function(m, f, ...) {
  and_then(m, f, ...)
}

#' @exportS3Method monad::join
join.maybe <- function(m) {
  maybe_flatten(m)
}