novah.option
Functions to work with optional values.
Types
Declarations
map
visibility: public
type: (a -> b) -> Option a -> Option b
Maps the function over this option if it has a value. Runtime: O(1)
flatMap
visibility: public
type: (a -> Option b) -> Option a -> Option b
Maps the function over this option if it has a value, but don't wrap the result in another option. Runtime: O(1)
maybe
visibility: public
type: b -> (a -> b) -> Option a -> b
Takes a default value, a function and an option and returns the result of the function applied to this option's value or the default value if the option is empty.
isSome
visibility: public
type: Option a -> Boolean
Returns true if this option contains a value.
isNone
visibility: public
type: Option a -> Boolean
Returns true if this option doesn't contain a value.
unwrap
visibility: public
type: Option a -> a
Extracts the value out of this option.
Unsafe: Will thrown an exception if the option is empty.
An alias for unwrapOptions and the !! syntactic sugar.
toOption
visibility: public
type: Nullable a -> Option a
Transforms this nullable value into an option.
null is represented as None.
toNullable
visibility: public
type: Option a -> Nullable a
Transforms this option into an nullable value. This function should only be used to interact with Java methods.
caseNull
visibility: public
type: b -> (a -> b) -> Nullable a -> b
Receives a default value, a function f and a possible null value.
If the value is null returns the default value, otherwise returns
f applied to the value.
fromOptional
visibility: public
type: Optional a -> Option a
Transforms a java.util.Optional into an option.
toOptional
visibility: public
type: Option a -> Optional a
Transforms an option into a java.util.Optional.