Function existsLoop

packages/effect/src/internal/fiberRuntime.ts:1786–1799

(
  iterator: Iterator<A>,
  index: number,
  f: (a: A, i: number) => Effect.Effect<boolean, E, R>
)

)

const existsLoop = <A, E, R>(
  iterator: Iterator<A>,
  index: number,
  f: (a: A, i: number) => Effect.Effect<boolean, E, R>
): Effect.Effect<boolean, E, R> => {
  const next = iterator.next()
  if (next.done) {
    return core.succeed(false)
  }
  return core.flatMap(
    f(next.value, index),
    (b) => b ? core.succeed(b) : existsLoop(iterator, index + 1, f)
  )
}

/* @internal */
export const filter = dual<