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//Simple Calback
function makeASandwitch(meat, cheese, condiment, callback){
    var sandwhich = "The sandwhich is " + meat + ' ' + cheese + ' and ' + condiment;
    callback(sandwhich);
}

makeASandwitch('ham', 'swiss', 'BBQ sauce', function(sandwhich){
    console.log(sandwhich);
});

//Optional Callback
function mySandwich(param1, param2, callback) {  
    alert('Started eating my sandwich.\n\nIt has: ' + param1 + ', ' + param2);  
    if (callback) {  
        callback();  
    }  
}  
  
mySandwich('ham', 'cheese');