count (method)

count

• count(predicate): 0 | 1

• Returns 0 or 1 for Some depending on whether the predicate holds. Returns 0 for None.

  It is a combination of Opt.filter and Opt.length.

  Parameters

  • predicate: ((_) => boolean)

    • • (_): boolean

      • Parameters

        • _: T

        Returns boolean

  Returns 0 | 1

  Example

  opt('Mu').count(x => x.length > 3) // 0
  opt('Ichi').count(x => x.length > 3) // 1
  

  See

  count