Kotlinでフィボナッチ数列的な

test.kt

import java.util.Iterator

fun main(args: Array<String>) {
  fibonacci(1000).forEach {println(it)}
}

fun fibonacci(max: Int): Iterator<Int> {
  var current = #(1, 1)
  return iterate<Int> {
    val next = current._1 + current._2
    if (next < max) {
      current = #(current._2, next)
      next
    } else {
      null
    }
  }
}