Function findKey

findKey<T>(obj: Nullable<T>, predicate?: ObjectIteratee<T>): Optional<string>
This method is like find except that it returns the key of the first element predicate returns truthy for instead of the element itself.
Type Parameters
- T
Parameters
- obj: Nullable<T>
  The object to search.
- Optionalpredicate: ObjectIteratee<T>
  The function invoked per iteration.
Returns Optional<string>
- Defined in nodash/external.ts:80