Function filter

filter<T>(fn: (value: T) => boolean, option: Option<T>): Option<T>
Returns None if the option is None, otherwise calls predicate with the wrapped value and conditionally returns the option or None.
Type Parameters
- T
Parameters
- fn: (value: T) => boolean
  Predicate.
- option: Option<T>
  Option to evaluate.
Returns Option<T>
Some<T> if the predicate returns true, or None if the predicate returns false.
- Defined in index.ts:184