Function either

either<U>(
def: () => U,
): <T>(mapper: (x: T, xs: List.List<T>) => U) => (list: List.List<T>) => U
Transforms the list either the current value exists or not.
Type Parameters
- U
Parameters
- def: () => U
  The function to produce default value.
Returns <T>(mapper: (x: T, xs: List.List<T>) => U) => (list: List.List<T>) => U
The transformed value.
- Defined in src/list.ts:345