对下一个值 javascript 求和的更好方法

Question

我有一个以下数组：

[

  {

    "model": "A",

    "count": "10",

    "date": "02-12-2004"

  },

  {

    "model": "B",

    "count": "20",

    "date": "02-01-2004"

  },

  {

    "model": "C",

    "count": "30",

    "date": "02-02-2004"

  }

]

我需要一个新的数组集如下

[

  {

    "model": "A",

    "count": "10",

    "date": "02-12-2004"

  },

  {

    "model": "B",

    "count": "30",

    "date": "02-01-2004"

  },

  {

    "model": "C",

    "count": "60",

    "date": "02-02-2004"

  }

]

这意味着所有以前的集合计数都应该添加到下一个集合中。

Answer 1

试试这个。arr=[{"model":"A", "count":"10","date":"02-12-2004"},{"model":"B", "count":"20","date":"02-01-2004"},{"model":"C", "count":"30","date":"02-02-2004"}]count=0;let arr2 = arr.filter(obj=>{  count+=parseInt(obj.count);  obj.count=count;})console.log(arr)如果您不想修改现有数组。 Object.assign使用如下方法arr=[{"model":"A", "count":"10","date":"02-12-2004"},{"model":"B", "count":"20","date":"02-01-2004"},{"model":"C", "count":"30","date":"02-02-2004"}]count=0;let arr2 = arr.map(obj=>{  count += parseInt(obj.count);  return Object.assign({}, obj, {   count:count  });});    console.log(arr2)