private mergeData(dataArray) {

  const mergedData = {

    items: [],

    money: {

      money1: 0,

      money2: 0,

      money3: 0,

    }

  }

  return dataArray.reduce((acc, curr) => {

    acc.items.push(...curr.items)

    acc.money.money1 += curr.money.money1

    acc.money.money2 += curr.money.money2

    acc.money.money3 += curr.money.money3

    return acc;

  }, mergedData)

}

{

      items: [],

      money: {

        money1: 0,

        money2: 0,

        money3: 0,

      }

    }