Function unwrapErr

unwrapErr<E, T>(res: Result.Result<E, T>): E
Unwraps the Err value from a Result, or throws an error.
Type Parameters
- E
- T
Parameters
- res: Result.Result<E, T>
  The value which should be an Err.
Returns E
The unwrapped item.

Examples
Example
```
expect(() => unwrapErr(ok(3))).toThrowError("unwrapped Ok");
expect(unwrapErr(err(4))).toStrictEqual(4);
```
- Defined in src/result.ts:397