package foo

import java.util.*

fun <T> ArrayList<T>.findAll(predicate: (T) -> Boolean): ArrayList<T> {
  val result = ArrayList<T>()
  for(t in this) {
    if (predicate(t)) result.add(t)
  }
  return result
}


fun box(): String {
  val list: ArrayList<Int> = ArrayList<Int>()

  list.add(2)
  list.add(3)
  list.add(5)


  val m: ArrayList<Int> = list.findAll<Int>({(name: Int) -> name < 4})
  return if (m.size() == 2) "OK" else "fail"
}