减少时间序列数组并聚合数据

Question

我看到很多帖子/问题都解决了这个问题，所以我认为这并不是微不足道的。我是一个初学者，正在寻找更优雅的解决方案。

我需要将这种包含1分钟详细数据的数组减少为5分钟数据。只需计算 5 分钟内连续值的总和，然后重新创建一个较短的数组。那么时间戳“created_at”应该是 5 分钟时间段结束的时间点。

let array = [
    { steps: 40, created_at: '2022-09-03T11:36:00.000Z' },
    { steps: 13, created_at: '2022-09-03T11:37:00.000Z' },
    { steps: 40, created_at: '2022-09-03T11:38:00.000Z' },
    { steps: 40, created_at: '2022-09-03T11:39:00.000Z' },
    { steps: 34, created_at: '2022-09-03T11:40:00.000Z' },
    { steps: 86, created_at: '2022-09-03T11:41:00.000Z' },
    { steps: 23, created_at: '2022-09-03T11:42:00.000Z' },
    { steps: 78, created_at: '2022-09-03T11:43:00.000Z' },
    { steps: 67, created_at: '2022-09-03T11:44:00.000Z' },
    { steps: 80, created_at: '2022-09-03T11:45:00.000Z' },
    { steps: 34, created_at: '2022-09-03T11:46:00.000Z' },
    { steps: 64, created_at: '2022-09-03T11:47:00.000Z' },
    { steps: 32, created_at: '2022-09-03T11:48:00.000Z' },
    { steps: 78, created_at: '2022-09-03T11:49:00.000Z' },
    { steps: 45, created_at: '2022-09-03T11:50:00.000Z' }
    ]

我认为我的解决方案太复杂了：

const moment = require(`moment`);
const newArray = array.map(
    (item)=> {       
      const timestamp = moment(item.created_at).valueOf();
      const timeStampgroup =  Math.ceil((timestamp)/300000);
      return {...item, timeStampgroup: timeStampgroup}    
        }
    );
//console.log(newArray);  

const reducedArray = Array.from(newArray.reduce(
    (m, {timeStampgroup: timeStampgroup, steps}) => m.set(timeStampgroup, (m.get(timeStampgroup) || 0) + steps), new Map
  ), ([timeStampgroup, steps]) => ({timeStampgroup, steps}));
//console.log(reducedArray);

const result = reducedArray.map(entry => ({steps : entry.steps, created_at : moment(entry.timeStampgroup*300000).toISOString()}));
console.log(result);

[
 { steps: 167, created_at: '2022-09-03T11:40:00.000Z' },
 { steps: 334, created_at: '2022-09-03T11:45:00.000Z' },
 { steps: 253, created_at: '2022-09-03T11:50:00.000Z' }
]

有没有人看到一种不太复杂的方法来实现相同的结果，也许一次性？

多谢 ！

洛伦佐

Answer 1

像这样？

const moment = require(`moment`)
require('moment-round')

const array = [
  { steps: 40, created_at: '2022-09-03T11:36:00.000Z' },
  { steps: 13, created_at: '2022-09-03T11:37:00.000Z' },
  { steps: 40, created_at: '2022-09-03T11:38:00.000Z' },
  { steps: 40, created_at: '2022-09-03T11:39:00.000Z' },
  { steps: 34, created_at: '2022-09-03T11:40:00.000Z' },
  { steps: 86, created_at: '2022-09-03T11:41:00.000Z' },
  { steps: 23, created_at: '2022-09-03T11:42:00.000Z' },
  { steps: 78, created_at: '2022-09-03T11:43:00.000Z' },
  { steps: 67, created_at: '2022-09-03T11:44:00.000Z' },
  { steps: 80, created_at: '2022-09-03T11:45:00.000Z' },
  { steps: 34, created_at: '2022-09-03T11:46:00.000Z' },
  { steps: 64, created_at: '2022-09-03T11:47:00.000Z' },
  { steps: 32, created_at: '2022-09-03T11:48:00.000Z' },
  { steps: 78, created_at: '2022-09-03T11:49:00.000Z' },
  { steps: 45, created_at: '2022-09-03T11:50:00.000Z' },
]

const result = Array.from(
  array.reduce((m, item) => {
    const key = moment(item.created_at).ceil(5, 'minutes').toISOString()
    return m.set(key, (m.get(key) || 0) + item.steps)
  }, new Map()),
  ([created_at, steps]) => ({ created_at, steps })
)

console.log(result)