如何找到相似数组对象值的总和并根据它们的值将它们分开

Question

I have the following array object

  [{ count: 2, created_data: "2022 07 19" },
  { count: 4, created_data: "2022 07 19" },
  { count: 4, created_data: "2022 07 19" },
  { count: 1, created_data: "2022 07 20" },
  { count: 1, created_data: "2022 07 20" }]

I would want to add the objects and get their sums based on the dates. So the result should look something like this

[{
  "2022 07 19" : 10,
  "2022 07 20" : 2
}]

Answer 1

Just group by the desired property using reduce method.

 var data = [{ count: 2, created_data: "2022 07 19" }, { count: 4, created_data: "2022 07 19" }, { count: 4, created_data: "2022 07 19" }, { count: 1, created_data: "2022 07 20" }, { count: 1, created_data: "2022 07 20" }] var result = [data.reduce(function(agg, item) { agg[item.created_data] = (agg[item.created_data] || 0) + item.count return agg }, {})] console.log(result)