nullable

Wraps a null or non-null value in an Either, while keeping the information on whether it is filled or empty.

Interactive example

Syntax

function nullable<
	const GenericInput extends unknown = null
>(
  input: GenericInput
): GenericInput extends null
  ? NullableEmpty
  : NullableFilled<GenericInput>;

Parameters

• input: Can be null or a concrete value.

Return value

• NullableFilled if the value exists.
• NullableEmpty if null.

See also

• nullableEmpty.
• nullableFilled.