The Maybe Monad

Documentation for package ‘maybe’ version 0.2.1

and	Combine predicate functions to check if all are TRUE
and_then	Evaluate a maybe returning function on a maybe value
bind	Evaluate a maybe returning function on a maybe value
fmap	Evaluate a function on a maybe value
from_maybe	Unwrap a maybe value or return a default
is_just	Check if an object is a 'Just' value
is_maybe	Check if an object is a maybe value
is_nothing	Check if an object is a 'Nothing' value
join	Flatten a nested maybe value
just	Create a 'Just' variant of a maybe value
maybe	Modify a function to return a maybe value
maybe_contains	Check if a maybe value contains a specific value
maybe_equal	Check if two maybe values are equal
maybe_flatten	Flatten a nested maybe value
maybe_map	Evaluate a function on a maybe value
nothing	Create a 'Nothing' variant of a maybe value
not_empty	Check if a vector or data frame is empty
not_infinite	Check if an object is not infinite
not_na	Check if an object is not NA
not_nan	Check if an object is not NaN
not_null	Check if an object is not NULL
not_undefined	Check if an object is not undefined
or	Combine predicate functions to check if any are TRUE
perhaps	Modify a function to return the value or a default value
with_default	Unwrap a maybe value or return a default