Creating basic iCalendar

Start off creating the basic data structure and set a property on that:

var comp = new ICAL.Component(['vcalendar', [], []]);
comp.updatePropertyWithValue('prodid', '-//iCal.js Wiki Example');

You can get the resulting iCalendar by calling comp.toString() at any time:

comp.toString();
// BEGIN:VCALENDAR
// PRODID:-//iCal.js Wiki Example
// END:VCALENDAR

Sub-components are created as needed and attached to the appropriate place in the "tree":

var vevent = new ICAL.Component('vevent'),
    event = new ICAL.Event(vevent);

// Set some properties
event.summary = 'foo bar';
event.uid = 'abcdef...';
event.dtstamp = ICAL.Time.now(); // Can give it instances of appropriate types

// Add the new component
comp.addSubcomponent(vevent);

Printing the full calendar now:

comp.toString()
// BEGIN:VCALENDAR
// PRODID:-//iCal.js Wiki Example
// BEGIN:VEVENT
// SUMMARY:foo bar
// UID:abcdef...
// DTSTAMP:20131126T110632Z
// END:VEVENT
// END:VCALENDAR