fold

Runs the suspending computation by creating a Continuation, and running the fold function over the computation.

When the Cont has shifted with R it will recover the shifted value to B, and when it ran the computation to completion it will transform the value A to B.

suspend fun test() {
  val shift = cont<String, Int> {
    shift("Hello, World!")
  }.fold({ str: String -> str }, { int -> int.toString() })
  shift shouldBe "Hello, World!"

  val res = cont<String, Int> {
    1000
  }.fold({ str: String -> str.length }, { int -> int })
  res shouldBe 1000
}

Like fold but also allows folding over any unexpected Throwable that might have occurred.

See also