opt

package

v0.1.2 Latest Latest Go to latest Published: Feb 8, 2026 License: MIT Imports: 1 Imported by: 0

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type Option[T any] struct {
	// contains filtered or unexported fields
}

Option is a type that represents an optional value.

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

None creates a new empty Option[T].

func Some[T any](val T) Option[T]

Some creates a new Option[T] with the given value.

func (o *Option[T]) Expect(msg string) T

Expect panics with the given message if the option is a None value.

func (o *Option[T]) IsNone() bool

IsNone returns true if the option is a None value.

func (o *Option[T]) IsSome() bool

IsSome returns true if the option is a Some value.

func (o Option[T]) IsZero() bool

IsZero lets `omitempty` drop this field when it's None (Go 1.20+).

func (o Option[T]) MarshalJSON() ([]byte, error)

MarshalJSON emits the inner value when Some, or null when None.

func (o *Option[T]) UnmarshalJSON(b []byte) error

UnmarshalJSON sets None on "null", or decodes T and sets Some.

func (o *Option[T]) Unwrap() T

Unwrap panics if the option is a None value.

func (o *Option[T]) UnwrapOr(def T) T

UnwrapOr returns the value of the option if it is a Some value, otherwise it returns the given default value.

func (o *Option[T]) UnwrapOrElse(fn func() T) T

UnwrapOrElse returns the value of the option if it is a Some value, otherwise it returns the result of the given function.