Trip.js

var dayjs = require('dayjs');

class Trip {
  constructor(tripData){
    this.tripData = tripData;
    this.today = dayjs().format('YYYY/MM/DD');
    this.userTrips;
    this.currentTrip;
    this.pastTrips;
    this.futureTrips;
    this.pendingTrips;
    this.tripsThisYear;
  }

  findTrips(id) {
    this.userTrips = this.tripData.filter((trip) => trip.userID === id)

    return this.userTrips;
  }

  findTenseOfTrip(trip) {
    let start = trip["date"];
    let end = dayjs(trip["date"]).add(trip["duration"], 'day').format('YYYY/MM/DD');

    if (dayjs(this.today).isBefore(end) && dayjs(this.today).isAfter(start)) {
      return "current"
    } else if (dayjs(this.today).isBefore(trip["date"])) {
      return "upcoming"
    } else if (dayjs(this.today).isAfter(trip["date"])){
      return "previous"
    }
  }

  findTripsInYear() {
    let startOfYear = dayjs(this.today).startOf('year').format('YYYY/MM/DD')
    let endOfYear = dayjs(this.today).endOf('year').format('YYYY/MM/DD')

    this.tripsThisYear = this.userTrips.filter(trip => dayjs(trip["date"]).isAfter(startOfYear, 'day') && dayjs(trip["date"]).isBefore(endOfYear, 'day') )
    return this.tripsThisYear;
  }
}

module.exports = Trip;