Mow Your Own Lawn Post (https://docs.google.com/document/d/1okP_aDz9zDea5F5PRpjdb_Ka6VAeHjmygLGB06IrL9E/edit?userstoinvite=nathan@heysparkbox.com&ts=569d0414&actionButton=1#)

my_app_spec.js

describe('myApp', () => {
  describe('.formatActivityMessage', () => {
    it('shows all data', () => {
      var activity = {
        "displayName": "Skippy John Jones",
        "formattedDateTime": "Earlier today",
        "activity": "Flew to space"
      }
      var result = myApp.formatActivityMessage(activity);
      expect(result).toEqual("Earlier today, Skippy John Jones Flew to space");
    });
  });
  
  describe('.formatActivities', () => {
    it('displayName happy path', () => {
      var activities = [{
          "user": { firstName: "Skippy", "lastName": "John Jones", "userName": "skippyJJ" },
          "written_at": "2012-04-23T18:25:43.511Z",
          "activity": "Space flight"
        }];
        
      var result = myApp.formatActivities(activities);
      expect(result[0].displayName).toEqual("Skippy John Jones (skippyJJ)");
    });
  });
});

myApp.js

var myApp = {
	formatActivities(data, asOf) {
  	var activities = data.activity;
  	asOf = asOf || moment(); // optional arguments make testing easier... sometimes
  	
		var formatted = activities.map( (activity) => {
    	return {
      	"displayName": `${activity.user.firstName} ${activity.user.lastName} (${activity.user.username})`,
        "formattedDateTime": moment(activity.written_at).from(asOf),
        "activity": activity.activity
      };
    });
    
    return formatted.map(myApp.formatActivityMessage);
  },
  formatActivityMessage(activity) {
  	return `${activity.formattedDateTime}, ${activity.displayName} ${activity.activity}`;
  }
};