noneIf (method)

noneIf

• noneIf(predicate): Opt<T>

• Returns None if predicate holds, otherwise passes same instance of Opt.

  Parameters

  • predicate: ((_) => boolean)

    • • (_): boolean

      • Parameters

        • _: T

        Returns boolean

  Returns Opt<T>

  Example

  opt(1).noneIf(x => x > 0); // None
  opt(-1).noneIf(x => x > 0); // Some(-1)
  

  See

  filter