Function makeReducerFailFast

repos/effect/packages/effect/src/UndefinedOr.ts:228–239

(reducer: Reducer.Reducer<A>)

 * @since 4.0.0
 */
export function makeReducerFailFast<A>(reducer: Reducer.Reducer<A>): Reducer.Reducer<A | undefined> {
  const combine = makeCombinerFailFast(reducer).combine
  const initialValue = reducer.initialValue as A | undefined
  return Reducer.make(combine, initialValue, (collection) => {
    let out = initialValue
    for (const value of collection) {
      out = combine(out, value)
      if (out === undefined) return out
    }
    return out
  })
}