option

func Filter ¶

func Filter[A any](o lang.Option[A], f func(A) bool) lang.Option[A]

func FlatMap ¶

func FlatMap[A, B any](o lang.Option[A], f func(A) lang.Option[B]) lang.Option[B]

func Flatten ¶

func Flatten[T any](o lang.Option[lang.Option[T]]) lang.Option[T]

func ForEach ¶

func ForEach[A any](o lang.Option[A], f func(A))

func FromEither ¶

func FromEither[L, R any](e lang.Either[L, R]) lang.Option[R]

FromEither converts an Either instance to an Option instance. If the Either instance is a Left, an empty Option is returned. Otherwise, an Option with the right value is returned.

func Map ¶

func Map[A, B any](o lang.Option[A], f func(A) B) lang.Option[B]

func None ¶

func None[T any]() lang.Option[T]

None returns an empty Option.

func Of ¶

func Of[T any](v T) lang.Option[T]

func OrElse ¶

func OrElse[A any](o lang.Option[A], f func() lang.Option[A]) lang.Option[A]

OrElse returns the given Option if it is defined. Otherwise, it returns the result of the given function.

func Sequence ¶

func Sequence[A any](os []lang.Option[A]) lang.Option[[]A]

Sequence merges a list of Option instances into a single Option instance. If any of the Option instances is empty, an empty Option is returned. Otherwise, an Option with the list of values is returned.

func Some ¶

func Some[T any](t T) lang.Option[T]

Some returns an Option with the given value.