Javascript从具有相同属性并具有相同键和添加量的不同对象创建公共对象答案

【问题标题】：Javscript create common object from different objects with same attribute and have same key and add amountJavascript从具有相同属性并具有相同键和添加量的不同对象创建公共对象
【发布时间】：2020-02-22 10:43:20
【问题描述】：

我正在尝试从 JSON 获取数据：

   {
        "data": {
            "Country": [
                {
                    "Area": "Urban",
                    "Date": "2019-10-14T12:14:20.170Z",
                    "income": [
                        {
                            "amount": "33",
                            "currency": "USD"
                        },
                        {
                            "amount": "10",
                            "currency": "INR"
                        }
                    ],
                    "expenditure": [
                        {
                            "amount": "5",
                            "currency": "INR"
                        }
                    ],
                    "tax": [
                        {
                            "amount": "10",
                            "currency": "USD"
                        },
                        {
                            "amount": "10",
                            "currency": "INR"
                        }
                    ]
                },
                {
                    "Area": "Rural",
                    "Date": "2019-10-14T12:14:20.170Z",
                    "income": [
                        {
                            "amount": "2",
                            "currency": "USD"
                        },
                        {
                            "amount": "20",
                            "currency": "INR"
                        }
                    ],
                    "loan": [
                        {
                            "amount": "5",
                            "currency": "INR"
                        }
                    ],
                    "tax": [
                        {
                            "amount": "10",
                            "currency": "USD"
                        },
                        {
                            "amount": "50",
                            "currency": "INR"
                        }
                    ]
                }
            ]
        }
    }

我想要一个通用对象来保存具有所有唯一键的数据，例如收入、支出，然后将具有相同货币的金额相加。

需要以下格式的结果：

{
"Area": "combined",
"income": [
    {
        "amount": "35",
        "currency": "USD"
    },
    {
        "amount": "30",
        "currency": "INR"
    }
],
"expenditure": [
    {
        "amount": "5",
        "currency": "INR"
    }
],
"loan": [
    {
        "amount": "5",
        "currency": "INR"
    }
],
"tax": [
    {
        "amount": "20",
        "currency": "USD"
    },
    {
        "amount": "60",
        "currency": "INR"
    }
]
}

如果尝试使用 map 和 reduce，但如果不使用 if else 语句检查对象内部是否存在值，然后执行操作，我将无法执行某些操作。

我尝试了以下方法：

jsonResponse.reduce(
// common_keys passing as hardcoded till loan ,tax etc
(result, { loan,tax}) => {
   forEach(tax, value => {
    const taxObj = find(result.tax, ['currency', value.currency]);
    !taxObj ? result.tax.push(value) : taxObj.amount = Number(taxObj.amount) + Number(value.amount);
  }); 

  forEach(loan, value => {
    const loanObj = find(result.loan, [
      'currencyCode',
      value.currency,
    ]);
    !loanObj ? result.loan.push(value): loanObj.amount = Number(loanObj.amount) + Number(value.amount);
  });
  //repeating for other too

  return result;
}

【问题讨论】：

到目前为止有什么努力吗？请发布您到目前为止编写的代码
到目前为止我的想法
你有一个currency 和多个currencyCode 对吗？
抱歉，只有货币放错了 json 响应

标签： javascript json ecmascript-6 reduce

【解决方案1】：

使用相同的currencyCode，您可以减少数组和嵌套数组。

var data = { data: { Country: [{ Area: "Urban", Date: "2019-10-14T12:14:20.170Z", income: [{ amount: "33", currencyCode: "USD" }, { amount: "10", currencyCode: "INR" }], expenditure: [{ amount: "5", currencyCode: "INR" }], tax: [{ amount: "10", currencyCode: "USD" }, { amount: "10", currencyCode: "INR" }] }, { Area: "Rural", Date: "2019-10-14T12:14:20.170Z", income: [{ amount: "2", currencyCode: "USD" }, { amount: "20", currencyCode: "INR" }], loan: [{ amount: "5", currencyCode: "INR" }], tax: [{ amount: "10", currencyCode: "USD" }, { amount: "50", currencyCode: "INR" }] }] } },
    result = data.data.Country.reduce((r, o) => {
        Object.entries(o).forEach(([k, v]) => {
            if (!Array.isArray(v)) return;
            v.reduce((q, { amount, currencyCode }) => {
                var temp = q.find(t => t.currencyCode === currencyCode);
                if (!temp) q.push(temp = { amount: 0, currencyCode });
                temp.amount = (+temp.amount + +amount).toString();
                return q;
            }, r[k] = r[k] || []);
        });
        return r;
    }, { "Area": "combined" });

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

【讨论】：