maybe_bind: Convert a one-track function to a two-track function.
In Teresa00/hfmAnnotation: HFM Internal Package for Annotations

Description Usage Arguments Format Value See Also Examples

A “bind” function or method can be thought of as feeding an input value to a function. This is known as “binding” a value to the parameter of the function. When you need to use a function that does not already take a Maybe type argument, use maybe_bind to "lift" a new function that *does* take a Maybe type argument.

1	maybe_bind(f)

`f`	A function taking a non-optional (one-track) argument and returning an optional (two-track) value.

maybe_bind :: (a -> b) -> (Maybe a -> Maybe b)

A function taking an optional (two-track) argument and returning an optional (two-track) value.

Other Maybe functions: as_maybe, is_nothing, maybe_apply, maybe_default, maybe_map_2, maybe_map_3, maybe_map_4, maybe_map_5, maybe_map, maybe_then, maybes_collapse, maybes_partition

library(assertthat)
is_maybe_numeric <- maybe_bind(is.numeric)
is_maybe_numeric(Just(1)) # Just(TRUE)
is_maybe_numeric(Just("cat")) # Just(FALSE)
is_maybe_numeric(Nothing()) # Nothing()