Function isErr

isErr<E, T>(res: Result.Result<E, T>): res is Err<E>
Checks whether the result is an Err.
Type Parameters
- E
- T
Parameters
- res: Result.Result<E, T>
  The result to be checked.
Returns res is Err<E>
Whether the result is an Err.
- Defined in src/result.ts:181