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javascriptarraysloopslodash

Copy one array values to the the others

I have below array of JSON. I want to set schedules for the dayOfWeek which are not present inside the schedules of the other rooms

const data = {
  rooms: [
    {
      roomId: 1,
      schedules: []
    },
    {
      roomId: 2,
      schedules: [
        { home1: "05:05", dayOfWeek: 1, away: "20:30" },
        { home1: "06:05", dayOfWeek: 5, away: "21:30" },
        { home1: "07:05", dayOfWeek: 7, away: "22:30" }
      ]
    },
    {
      roomId: 3,
      schedules: []
    }
  ]
}

I need to copy the same schedules to the other rooms as well.

expected output

const finalArray = [
  { home1: "05:05", dayOfWeek: 1, away: "20:30", roomId: 1 }, //schedules from room2
  { home1: "06:05", dayOfWeek: 5, away: "21:30", roomId: 1 }, //schedules from room2
  { home1: "07:05", dayOfWeek: 7, away: "22:30", roomId: 1 }, //schedules from room2 

  { home1: "05:05", dayOfWeek: 1, away: "20:30", roomId: 3 }, //schedules from room2
  { home1: "06:05", dayOfWeek: 5, away: "21:30", roomId: 3 }, //schedules from room2
  { home1: "07:05", dayOfWeek: 7, away: "22:30", roomId: 3 }, //schedules from room2 
]

I have tried but could not get it work!!! Please help!!!

Solution

  • You can first find the source of truth room and then use Array.reduce to extract/copy the schedules to the others:

    const data = { rooms: [ { roomId: 1, schedules: [] }, { roomId: 2, schedules: [ { home1: "05:05", dayOfWeek: 1, away: "20:30" }, { home1: "06:05", dayOfWeek: 5, away: "21:30" }, { home1: "07:05", dayOfWeek: 7, away: "22:30" } ] }, { roomId: 3, schedules: [] } ] }

const theRoom = data.rooms.find(x => x.schedules.length)
const result = data.rooms.reduce((r,{roomId, schedules}) => {
  if(roomId != theRoom.roomId)
     r.push(...theRoom.schedules.map(x => ({ roomId, ...x })))
  return r
}, [])
console.log(result)