closures5.js

function makeCalendar(name) {
  var calendar = {
    owner: name,
    events: [],
  };
  
  return {
    addEvent: function(event, dateString) {
      var eventInfo = {
        event: event,
        date: new Date(dateString),
      };
      calendar.events.push(eventInfo);
      calendar.events.sort(function(a, b) {
        return a.date - b.date;
      });
    },
    
    listEvents: function() {
      if (calendar.events.length > 0) {
        console.log(calendar.owner + "'s events are: ");
        
        calendar.events.forEach(function(eventInfo) {
          var dateStr = eventInfo.date.toLocaleDateString();
          var description = dateStr + ": " + eventInfo.event;
          
          console.log(description);
        });
      } else {
        console.log(calendar.owner + " has no events.");
      }
    },
  };
}

var babbageCalendar = makeCalendar("Charles Babbage");

babbageCalendar.addEvent("Coffee with Ada.", "8/7/2018");
babbageCalendar.addEvent("Difference Engine presentation.", "8/2/2018");

babbageCalendar.listEvents();
  /*
    Logs:
    Charles Babbage's events are: 
    8/2/2018: Difference Engine presentation.
    8/7/2018: Coffee with Ada.
  */