flatMap (method)

Abstract flatMap

• flatMap<U>(f): Opt<U>

• Similar to Opt.map, but function is expected to return Opt which will be returned. Useful for including steps which may fail or return no value.

  some(1).flatMap(x => x === 1 ? none : some(x + 1)) // None
  none.flatMap(x => some(1)) // None
  

  Type Parameters

  • U

  Parameters

  • f: ((_) => Opt<U>)

    • • (_): Opt<U>

      • Parameters

        • _: T

        Returns Opt<U>

  Returns Opt<U>

  See

  flatMap