Checks whether the event is the head of a recurring series.


Boolean return true if event is a recurrence head.

Example - check whether an event is a recurrence head

    var event = new{
        id: 1,
        title: "Task1",
        start: new Date("2013/4/4"),
        end: new Date("2013/4/4"),
        recurrenceRule: "FREQ=DAILY"

/* The result can be observed in the DevTools(F12) console of the browser. */
    console.log(event.isRecurrenceHead()); //logs 'true'
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