Filter with toggling machine

readme.md

graph TB

Closed-->|First|First
Closed-->|Second|Second
First-->|First|Closed
First-->|Second|Second
Second-->|First|First
Second-->|Second|Closed
style Closed fill:#222,color:#ffde00 

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filter-machine.js

export function* OpenFilter() {
  function* Closed() {
    yield on("First", First);
    yield on("Second", Second);
  }
  function* First() {
    yield on("First", Closed);
    yield on("Second", Second);
  }
  function* Second() {
    yield on("First", First);
    yield on("Second", Closed);
  }

  return Closed;
}