whenIsNullableEmpty

Executes a callback only when the Either is NullableEmpty.

Interactive example

Syntax

Classic signature

function whenIsNullableEmpty<
  const GenericInput extends unknown,
  const GenericOutput extends AnyValue | EscapeVoid
>(
  input: GenericInput,
  theFunction: (value: Unwrap<Extract<ToEither<GenericInput>, EitherNullableEmpty>>) => GenericOutput
): GenericOutput | Exclude<ToEither<GenericInput>, EitherNullableEmpty>;

Curried signature

function whenIsNullableEmpty<
  const GenericInput extends unknown,
  const GenericOutput extends AnyValue | EscapeVoid
>(
  theFunction: (value: Unwrap<Extract<ToEither<GenericInput>, EitherNullableEmpty>>) => GenericOutput
): (input: GenericInput) => GenericOutput | Exclude<ToEither<GenericInput>, EitherNullableEmpty>;

Parameters

• theFunction: Callback called when there is no value.
• input: Value/Either to process.

Return value

Result of the callback if null, otherwise the original value.

See also

• whenIsNullableFilled.
• nullable.