Function diff

packages/effect/src/internal/differ/hashSetPatch.ts:103–117

(
  oldValue: HashSet.HashSet<Value>,
  newValue: HashSet.HashSet<Value>
)

/** @internal */
export const diff = <Value>(
  oldValue: HashSet.HashSet<Value>,
  newValue: HashSet.HashSet<Value>
): Differ.HashSet.Patch<Value> => {
  const [removed, patch] = HashSet.reduce(
    [oldValue, empty<Value>()] as const,
    ([set, patch], value: Value) => {
      if (HashSet.has(value)(set)) {
        return [HashSet.remove(value)(set), patch] as const
      }
      return [set, combine(makeAdd(value))(patch)] as const
    }
  )(newValue)
  return HashSet.reduce(patch, (patch, value: Value) => combine(makeRemove(value))(patch))(removed)
}

/** @internal */
export const combine = Dual.dual<