Events_step1_JS

(function(){
    console.log('Hello. Step 1. The simplest possible variant. A function calls another function - event listener.');
    // I will be creating events
    // 1) Only 1 class. The function trigger and the event listener are in the same class.
    // Everyhtign is hard coded listeners can not be called at runtime in C# for example in JS we will not have problems.
    // Even in C# we can inherit and override the function "onExecuteSomething"
    function A()
    {
        this.executeSomething = function(){ // the trigger
            console.log('I have to execute something and call the event listener afterwords');
            this.onExecuteSomething();
            // if you want to trigger another listener you have to add extra code here
            // ... this.anotherOnExecuteSomethign
        };

        // In the very same class I can define an event listener
        // Event listener
        this.onExecuteSomething = function(){ // the listener
            console.log('I have been called by executeSomething/foo/bar/bas');
        }
    }

    // Instantiate an object call the method(s)
    var a = new A();
    a.executeSomething();

})();