The Maybe Monad

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Documentation for package ‘maybe’ version 1.1.0

• DESCRIPTION file.
• Package NEWS.

Help Pages

and	Combine predicate functions to check if all are TRUE
and_then	Evaluate a maybe returning function on a maybe value
and_then2	Evaluate a binary maybe returning function on two maybe values
and_then3	Evaluate a ternary maybe returning function on three maybe values
bind	Evaluate a maybe returning function on a maybe value
filter_justs	Filter and unwrap a list of 'Just' values
filter_map	Map a function over a list and filter only 'Just' values
fmap	Evaluate a function on a maybe value
from_just	Unwrap a 'Just' value or throw an error
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_case	Unwrap and call a function on a maybe value or return a default
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
maybe_map2	Evaluate a binary function on two maybe values
maybe_map3	Evaluate a ternary function on three maybe values
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