如何减少数组得到所需对象的总和？

Question

我有一大堆对象需要总和所需的键。我尝试用reduce做，但是，不能让它工作。即使我尝试使用acc[item.agent_state] = acc + (+item.duration)，返回值也始终是单值

const states = _.uniqBy(data, function (e) {
  return e.agent_state;
});

const mappedStates = states.map(item => item.agent_state)

// const mappedStates = ['Logged-in']

const sumValues = data.filter(item => {
  return mappedStates.includes(item.agent_state)
})



const result = sumValues.reduce((acc, item, index, array) => {
    acc[item.agent_state] = +item.duration
    return acc

}, {})

Fiddle

Answer 1

正如评论中所提到的，你应该使用+=来增加。使用acc[item.agent_state] = +item.duration每次只需重新分配属性。

并且您需要确保在尝试向其添加任何内容之前将acc对象初始化为零。否则你会得到NaN，因为你试图添加一个未定义的值。

例如：

const sumValues = [
  {agent_state: "state1", duration: 1},
  {agent_state: "state2", duration: 1},
  {agent_state: "state1", duration: 1},
  {agent_state: "state1", duration: 1},
  {agent_state: "state2", duration: 5},
  {agent_state: "state1", duration: 10},
  {agent_state: "state3", duration: 0}
]

const result = sumValues.reduce((acc, item, index, array) => {
  // iniliaze to 0 before trying to add things
  if (!acc.hasOwnProperty(item.agent_state)) acc[item.agent_state] = 0
  acc[item.agent_state] += item.duration
  return acc

}, {})
console.log(result)

Answer 2

这是reduce的一个工作示例。你的数据集非常大，所以我修剪了一些条目。完整数据集的输出应为：

Logged-in: 343435,
Logout   : 0,
Not Ready: 169516,
Ready    : 6632,
Reserved : 28,
Talking  : 373

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