Check for the element inside the nested array

Question

I have below json

const data = {
    rooms: [
        {
            roomId: 1,
            schedules: [
                { home1: "06:00", dayOfWeek: 1, away: "21:30" },
                { home1: "06:05", dayOfWeek: 2, away: "22:30" }
            ]
        },
        {
            roomId: 2,
            schedules: [
                { home1: "06:00", dayOfWeek: 4, away: "21:30" },
                { home1: "06:05", dayOfWeek: 5, away: "22:30" }
            ]
        }
    ]
}

Now I need to push the above elements for the dayOfWeek which are not present inside the schedules array of both the rooms

This is the output I want

const finalOuput = [
    //for room 1
    { home1: "00:00", dayOfWeek: 3, away: "02:30", roomId: 1 },
    { home1: "00:00", dayOfWeek: 4, away: "02:30", roomId: 1 },
    { home1: "00:00", dayOfWeek: 5, away: "02:30", roomId: 1 },
    { home1: "00:00", dayOfWeek: 6, away: "02:30", roomId: 1 },
    { home1: "00:00", dayOfWeek: 7, away: "02:30", roomId: 1 },
    //for room 2
    { home1: "00:00", dayOfWeek: 1, away: "02:30", roomId: 2 },
    { home1: "00:00", dayOfWeek: 2, away: "02:30", roomId: 2 },
    { home1: "00:00", dayOfWeek: 3, away: "02:30", roomId: 2 },
    { home1: "00:00", dayOfWeek: 6, away: "02:30", roomId: 2 },
    { home1: "00:00", dayOfWeek: 7, away: "02:30", roomId: 2 },
]

I have tried loop over the rooms array something like This

const finalOuput = []
rooms.map((room) => {
    room.schedules.map((schedule) => {
        finalOuput.push(schedule)
    })
})

But don't know how to check for the dayOfWeek which are not present inside the rooms schedules.

Can someone please help to acheive this. Thank you!!!

Answer 1

ES6 only solution:

const data = { rooms: [{ roomId: 1, schedules: [{ home1: "06:00", dayOfWeek: 1, away: "21:30", roomId: 1 }, { home1: "06:05", dayOfWeek: 2, away: "22:30", roomId: 1 } ] }, { roomId: 2, schedules: [{ home1: "06:00", dayOfWeek: 4, away: "21:30", roomId: 2 }, { home1: "06:05", dayOfWeek: 5, away: "22:30", roomId: 2 } ] } ] }

const getSchedules = (room) => {
  let weekDays = [...Array(8).keys()]
  weekDays.shift()
  let days = weekDays.filter(x => !room.schedules.some(y => y.dayOfWeek == x))
  return days.map(y => ({ home1: "00:00", dayOfWeek: y, away: "02:30", roomId: room.roomId }))
}

console.log(data.rooms.reduce((r,c) => (r.push(...getSchedules(c)), r), [])) 

Lodash version:

const data = { rooms: [{ roomId: 1, schedules: [{ home1: "06:00", dayOfWeek: 1, away: "21:30", roomId: 1 }, { home1: "06:05", dayOfWeek: 2, away: "22:30", roomId: 1 } ] }, { roomId: 2, schedules: [{ home1: "06:00", dayOfWeek: 4, away: "21:30", roomId: 2 }, { home1: "06:05", dayOfWeek: 5, away: "22:30", roomId: 2 } ] } ] }

const getSchedules = (room) => {
  let days = _.difference(_.range(1,8), _.map(room.schedules, 'dayOfWeek'))
  return days.map(y => ({ home1: "00:00", dayOfWeek: y, away: "02:30", roomId: room.roomId }))
}
console.log(_.reduce(data.rooms, (r,c) => (r.push(...getSchedules(c)), r), []))

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

The idea is to use the the difference between the range of 1...7 and the current days in each room.schedule via (_.difference & _.range in lodash and Array.filter in ES6) and just hydrate the result in the resulting output.