function weekdayText(weekdays) {
     return function getText(target) {
       return weekdays[target] || (function() {
         throw new Error(`Invalid weekday numer ${target}`)
       }());
     }
   }

   daysInWeek = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'];
   
   getText = weekdayText(daysInWeek)
   
   console.log(getText(5))