Description Usage Arguments Format Value See Also Examples
Determines whether or not its value is of type Nothing
1 | is_nothing(m)
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m |
A Maybe type object (Just | Nothing) |
is_nothing :: Maybe a -> Boolean
A boolean indicating whether its value is of type Nothing
Other Maybe functions: as_maybe,
maybe_apply, maybe_bind,
maybe_default, maybe_map_2,
maybe_map_3, maybe_map_4,
maybe_map_5, maybe_map,
maybe_then, maybes_collapse,
maybes_partition
1 2 3 4 5 | is_nothing(Nothing()) # TRUE
is_nothing(Just(1)) # FALSE
## Not run: is_none(NA) # ERROR
## Not run: is_none(NULL) # ERROR
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