aiken/examples/acceptance_tests/020/lib/tests.ak

pub fn map(opt: Option<a>, f: fn(a) -> result) -> Option<result> {
  when opt is {
    None ->
      None
    Some(a) ->
      Some(f(a))
  }
}

test map_2() {
  map(Some(14), fn(n) { n + 1 }) == Some(15)
}