Example of Arity-18 for Validated

Validated.kt

/**
 * In Arrow we only provide functions up to arity-9,
 * using Tuple we can easily compose up to arity-n.
 *
 * A small example to show Validated#zip for arity-18
 */

fun validated(): ValidatedNel<String, Int> =
  "example".invalidNel()

validated().zip(
  validated(),
  validated(),
  validated(),
  validated(),
  validated(),
  validated(),
  validated(),
  validated(),
  ::Tuple9
).zip(
  validated(),
  validated(),
  validated(),
  validated(),
  validated(),
  validated(),
  validated(),
  validated()
) { (a, b, c, d, e, f, g, h, i), j, k, l, m, n, o, p, q, r ->
   // Consume 18 validated values
}