Karlas google apps script

main.js

function course(seats, name) {
  this.seats = seats
  this.enrolled = 0
  this.name = name
  this.increment = function() {
    this.enrolled++
  }
  this.isFull = function() {
    return this.enrolled >= this.seats
  }
}

var puzzles = new course(30, 'Puzzles and Games')
var studyHall = new course(30, 'Study Hall/Doodling')
var csi = new course(30, 'Crime scene investigation')
var pe = new course(30, 'Physical education')


function findCourseObject(name) {
  switch (name) {
    case 'Puzzles and Games':
      return puzzles
    case 'Study Hall/Doodling':
      return studyHall
    case 'Crime scene investigation':
      return csi
    case 'Physical education':
      return pe
        
  }
}

var choices = {
  one: {
    course: findCourseObject('Puzzles and Games'),
    taken: false
  },
  two: {
    course: findCourseObject('Study Hall/Doodling'),
    taken: false
  },
  three: {
    course: findCourseObject('Crime scene investigation'),
    taken: false
  },
  four: {
    course: findCourseObject('Physical education'),
    taken: false
  }
}


var currentSession = ''

for (let c in choices) {
  if (!choices[c].taken && !choices[c].course.isFull() && currentSession === '') {
    currentSession = choices[c].course.name
    choices[c].course.increment()
    choices[c].taken = true
    break
  }
}