Cassidoo

function newYearsDay (year) {
  const dayOfTheWeekMap = {
    0: 'Sunday',
    1: 'Monday',
    2: 'Tuesday',
    3: 'Wednesday',
    4: 'Thursday',
    5: 'Friday',
    6: 'Saturday'
  }
  const date = new Date(`1/1/${year}`)

  return dayOfTheWeekMap[date.getDay()]
}