higher_order_functions

// Define an object with some properties and a method:
var clientData = {
    id: 094545,
    newId: function() {
        var id = "";
        for (var idx in String(this.id)) {
            id += String(Math.floor(Math.random()*10));
        }
        this.id = Number(id);
    },
    fullName: "Not Set",
    // setUserName is a method on the clientData object
    setUserName: function(firstName, lastName) {
        // this refers to the fullName property in this object
        this.fullName = firstName+" "+lastName;
    }
}
function getUserInput(firstName, lastName, callback, callbackObj) {
    // Do otherstuff tovalidate name here
    // The use of the Apply function below will set the this object to be callbackObj
    callback.apply(callbackObj, [firstName, lastName]);
};
// Pass the clientData.setUserName method and the clientData object as parameters.
// The clientData object will be used by the Apply function to set the this object​
getUserInput("Barack", "Obamanation", clientData.setUserName, clientData);

// the fullName property on the clientData was correctly set​
console.log(clientData.fullName);