A simple C#-style event system in Javascript

createEvent.js

function createEvent() {
    var handlers = [];
    var event = function(handler) {
        if (arguments.length === 0) {
            for(var i = 0, action; (action = handlers[i]); i++) {
                action();
            }
            return;
        }
        handlers.push(handler);
    };
    return event;
}
 
// example usage
var person = {
    age: 99,
    onDeath: createEvent(),
    birthday: function() {
        if (++this.age >= 100) {
            this.onDeath();
        }
    }
};
person.onDeath(function() { console.log('I died'); });
person.birthday(); // console prints 'I died'