Function when

when<T, R>(thing: Nullable<T>, doWork: (inp: T) => R): Maybe<R>
When something is defined, do something with it.
Type Parameters
- T
- R
Parameters
- thing: Nullable<T>
  The thing to check
- doWork: (inp: T) => R
  What to do if the thing is defined
Returns Maybe<R>
- returns undefined if "thing" is not defined or whatever is returned from doWork
- Defined in src/maybe.ts:33