Function fromOptional

fromOptional<L>(value: undefined, error: L): Left<never, L>
Either constructor from optional value

Resolves to 'left error' in case of undefined value and 'right value' otherwise
Type Parameters
- L
  underlying error type
Parameters
- value: undefined
  possibly undefined value
- error: L
  error to use in case of undefined value
Returns Left<never, L>
either 'right value' or 'left error'
- Defined in either.ts:541
fromOptional<R>(value: Exclude<R, undefined>, error: unknown): Right<R, never>
Either constructor from optional value

Resolves to 'left error' in case of undefined value and 'right value' otherwise
Type Parameters
- R
  underlying value type
Parameters
- value: Exclude<R, undefined>
  possibly undefined value
- error: unknown
  error to use in case of undefined value
Returns Right<R, never>
either 'right value' or 'left error'
- Defined in either.ts:542
fromOptional<R, L>(value: R | undefined, error: L): Either<R, L>
Either constructor from optional value

Resolves to 'left error' in case of undefined value and 'right value' otherwise
Type Parameters
- R
  underlying value type
- L
  underlying error type
Parameters
- value: R | undefined
  possibly undefined value
- error: L
  error to use in case of undefined value
Returns Either<R, L>
either 'right value' or 'left error'
- Defined in either.ts:543