mapOpt ()

mapOpt<A, B>(f): ((xs) => B[])
Similar to Array.map, but also allows omitting elements.
```
mapOpt((x: number) => x > 0 ? opt(x) : none)([-1, 0, 1]) // [1]
```
Type Parameters
- A
- B
Parameters
- f: ((_) => Opt<B>)
  - - (_): Opt<B>
    - Parameters
      _: A
      Returns Opt<B>
Returns ((xs) => B[])
- - (xs): B[]
  - Parameters
    - xs: readonly A[]
    Returns B[]
- Defined in Opt.ts:2349