option

Documentation

Index

• func GetOrElse[A any](a Option[A], def A) A
• type None
• type Option
  • func FlatMap[A, B any](a Option[A], f func(A) Option[B]) Option[B]
  • func Map[A, B any](a Option[A], f func(A) B) Option[B]
• type Some

Functions

func GetOrElse

func GetOrElse[A any](a Option[A], def A) A

Types

type None

type None[A any] struct{}

type Option

type Option[A any] interface{}

Represents optional values. Instances of Option are either an instance of Some or a type-safe empty structure None. The most idiomatic way to use an Option instance is to treat it as a collection or monad and use Map or FlatMap. If None is returned from any operation in the chain, the entire expression results in None[T]. This allows for sophisticated chaining of Option values without having to check for the existence of a value.

func FlatMap

func FlatMap[A, B any](a Option[A], f func(A) Option[B]) Option[B]

func Map

func Map[A, B any](a Option[A], f func(A) B) Option[B]

type Some

type Some[A any] struct {
	Value A
}