Basic Javascript callback functions

basicCallbacks.js

/* 
 * Understanding basic Javascript callback functions
 * By: Brandon Tillman
 * Website: BrandonTillman.com
*/

(function(){
    'use strict';
    
    var callback_examples = {
        // Calls back with a number that is 1-100
        get_randomNumber: function(callback) {
            var randomNumber = Math.floor((Math.random() * 100) + 1);
            // Returns randomNumber to the anonymous function
            callback(randomNumber);
        },
        // Calls back with a name via index
        get_nameByIndex: function(index, callback) {
            var names = [
                "Foo",
                "Bar",
                "Mr.Callback"]
            // Returns the name to the anonymous function
            callback(names[index]);
        }
    };
    
    // Helper function to log the results
    function logResult(functionName, result) {
        console.log("The result of %s is: %s", functionName, result);  
    };
    
    // Call our functions
    callback_examples.get_randomNumber(function(num) { // <-- Anonymous function with the callback
        logResult("get_randomNumber", num);
    });
    
    callback_examples.get_nameByIndex(2, function(name){ // <-- Index along with anonymous function
        logResult("get_nameByIndex", name);
    });
})();