Function unless

unless<T, R>(thing: Nullable<T>, doWork: () => R): Maybe<R>
When something is undefined (or null), do something. - Opposite of when
Type Parameters
- T
- R
Parameters
- thing: Nullable<T>
  The thing to check
- doWork: () => R
  What to do if the thing is undefined
Returns Maybe<R>
- returns undefined if "thing" is defined or whatever is returned from doWork
- Defined in src/maybe.ts:55