js 数组对象处理

Question

[{backupType: "全备", weekCycle: 1, weekDay: 0, sequenceNumber: 1}{backupType: "全备", weekCycle: 1, weekDay: 0, sequenceNumber: 2}{backupType: "全备", weekCycle: 1, weekDay: 1, sequenceNumber: 2}{backupType: "全备", weekCycle: 1, weekDay: 2, sequenceNumber: 3}{backupType: "全备", weekCycle: 1, weekDay: 3, sequenceNumber: 3}{backupType: "全备", weekCycle: 1, weekDay: 6, sequenceNumber: 3}]根据sequenceNumber，将数组分为三个部分，sequenceNumber一致的放在一块如[{backupType: "全备", weekCycle: 1, weekDay: 0, sequenceNumber: 1}{backupType: "全备", weekCycle: 1, weekDay: [0,1], sequenceNumber: 2}{backupType: "全备", weekCycle: 1, weekDay: [2,3,6], sequenceNumber: 3}]

Answer 1

let data = [

  {backupType: "全备", weekCycle: 1, weekDay: 0, sequenceNumber: 1},

  {backupType: "全备", weekCycle: 1, weekDay: 0, sequenceNumber: 2},

  {backupType: "全备", weekCycle: 1, weekDay: 1, sequenceNumber: 2},

  {backupType: "全备", weekCycle: 1, weekDay: 2, sequenceNumber: 3},

  {backupType: "全备", weekCycle: 1, weekDay: 3, sequenceNumber: 3},

  {backupType: "全备", weekCycle: 1, weekDay: 6, sequenceNumber: 3}

]

let cache = {}

data = data.filter(item => {

  let num = item.sequenceNumber

  let weekDay = item.weekDay

  let tmp = cache[num]

  if (tmp) {

    let tmpWeekDay = tmp.weekDay

    if (Array.isArray(tmpWeekDay)) {

      tmpWeekDay.push(weekDay)

    } else {

      tmp.weekDay = [tmpWeekDay, weekDay]

    }

    return false

  } else {

    cache[num] = item

    return true

  }

})