React Native遍历数组对象并计算求和值

我正在我的React原生应用程序中编写一个函数,我调用了一个api,它将我的json数组转换为对象,并存储在 this.props.data :

           [{name:'Jhon', income:28, spending:20},
            {name:'Anna', income:82, spending:50},
            {name:'Peter', income:141, spending:70}
           ]

我希望遍历这个数组对象,并将收入和支出值相加,最终生成一个新对象(everyone)并与原始对象匹配 这是道具数据

           [{name:'Jhon', income:28, spending:20},
            {name:'Anna', income:82, spending:50},
            {name:'Peter', income:141, spending:70},
            {name:'Everyone', income:251, spending:140}
           ]

我目前的尝试如下,但并不真正有效,请用代码示例给出建议,谢谢

const CustomListview = ({ itemList }) => (
    var everyoneObject = {
      name: 'everyone',
      income: 0,
      spending: 0
    }

    itemList.map(({name, income, spending}) => { 
        everyoneObject = {
          name: 'everyone',
          income: income++,
          spending: spending++
        }
    })

    itemList.push(everyoneObject);

    <View style={styles.container}>
        <FlatList
            data={itemList}
            renderItem={({ item }) =>
              <TillReportRow
                  name={item.name}
                  income={item.income}
                  spending={item.spending}
              />}
            keyExtractor={(item, index) => index.toString()}
        />
    </View>
);