Javascript基于另一个值在json中获取值

Question

我有一个类似于这个的json

 {      
    "id": "1",
    "month": "January",
    "type": "inc",
    "Value": "780.00",
    "year": "2018",
  },

 {      
    "id": "2",
    "month": "January",
    "type": "inc",
    "Value": "80.00",
    "year": "2018",
  },
 {      
    "id": "3",
    "month": "February",
    "type": "inc",
    "Value": "100.00",
    "year": "2018",
  },...

现在我需要Value从对象中获取所有月份的所有内容,因为您可以看到我可能有更多具有相同月份名称的对象.我越接近创建2个数组1,其中包含Months和1的值,但是我被卡住,有人可以引导我走正确的道路吗？

期望的输出是获得这样的数组["January"=>1500, "February"=>2000...]或者有2个数组,1表示有收入的月份列表(我已经有它),第二个是这几个月的总收入,所以就像这样:["January", "February", "March"..]第二个一[1500, 2000, 300...]

Answer 1

您可以使用该函数逐月Array.prototype.reduce求和Value.

let arr =  [{          "id": "1",    "month": "January",    "type": "inc",    "Value": "780.00",    "year": "2018",  }, {          "id": "2",    "month": "January",    "type": "inc",    "Value": "80.00",    "year": "2018",  }, {          "id": "3",    "month": "February",    "type": "inc",    "Value": "100.00",    "year": "2018",  }],
    result = arr.reduce((a, {month, Value}) => {
      a[month] = (a[month] || 0) + +Value;
      return a;
    }, Object.create(null));
  
console.log(result);

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