spyName != null Enter your name. variable name: spyName Cargo Bay

Fun for the whole family!

spyName = " + spyName + "" ]]> To create a variable, the general setup is <variable type> <variable name> = <value>; Your name consists of a series of characters (letters). A series of characters is called a string. Here is an example of creating a variable: var great_name = \"Robert); DROP TABLE Students;--\" Fine, I'll give you a name. See how you like it: spyName = \"Helpless\" authorizedPerson == spyName Get the recognizer to recognize you. Variable to reset: authorizedPerson. Cargo Bay

Fool the recognizer!

Authorized person: " + authorizedPerson + "
Your name: " + spyName + "" ]]> To change the value of a variable type <variable_name> = <value>; There's a certain variable here that specifies what person is authorized to pass. Currently, you shall not pass. I'm telling the recognizer to let you through: authorizedPerson = spyName handleRotation == 42 Open the door. Variable to reset: handleRotation Cargo Bay

Open the door.

Handle rotation: " + handleRotation + "º" ]]> Remember: To create a variable, the general setup is <variable type> <variable name> = <value>; To set your name you entered \"spyName = <spyName>;\" We want to set the knob to having been turned a certain number of degrees. It can be any rational number of degrees. In programming, we tend to call rational numbers 'floats'. Here is an example of creating a float variable: var pi = 3.14 The door handle needs to be at a 42 degree angle. Like this: handleRotation = 42 airlockPressure == zeppelinPressure Equalize the air pressure. Variable names: airlockPressure, zeppelinPressure Airlock

Equalize the air pressure.

Zeppelin pressure: " + zeppelinPressure + "
Airlock pressure: " + airlockPressure + "" ]]> Variables are useful, but we also need procedural structure. In programming, we use \"control structures\" to control the flow of execution. Looks like a loop of some kind would be useful here. Maybe you should try a 'while' loop. The syntax of a 'while' loop is like this: while( <condition> ) { <operations to perform> }; I'm not going in there without air! Do it this way: while(airlockPressure < zeppelinPressure) { airlockPressure += 1.0 } airlockPressure == zeppelinPressure && airlockCombo[0] == 1 && airlockCombo[1] == 9 && airlockCombo[2] == 4 && airlockCombo[3] == 1 Open the door. Array name: airlockCombo Airlock

Unlock the door.

Current lock combination: " + airlockCombo[0] + "" + airlockCombo[1] + "" + airlockCombo[2] + "" + airlockCombo[3] + "" ]]> And what if we want to store things in a list, for instance? We could use an array, and then access each value by its index in the array. In most languages arrays use indexes, so the numbering starts from zero. The first item in an array named 'arr' would be arr[0]. Likewise, the second would be arr[1], and so on. Mainly just pretend that you're a pirate. Savvy? Just because I know everything . . . oh hey, look: airlockCombo[0] = 1; airlockCombo[1] = 9; airlockCombo[2] = 4; airlockCombo[3] = 1; madeKey > 1 Make a key. Call it myKey. Empire State Building

You need a key to get in." ]]> Remember creating an instance of a variable? We said String name = \"" + spyName + "\". Creating an instance of an object is much like that: var <variableName> = new <object Type>() If I wanted to create an instance of a object of type Season called fireflySeason2 I would type Season fireflySeason2 = new Season() I see. Never send a human to do a machine's job. Creating a key by typing: var myKey = new Key(); officeDrawer.isOpen() Open the drawer variable names: officeDrawer, myKey. Empire State Building

Must be in the drawer..." ]]> Objects do stuff. To tell the object to do something, the general structure is <variableOfProperObjectType>.<method> If I wanted you to answer on your own, I would say you.answer() Occasionally, the method has a variable passed into it. In this case, we want to pass the method open the key that we are using to open the drawer. The form for passing a method a variable parameter is <method>(<parameter>). For example if I wanted you to answer a specific question I'd type you.answer(question1). Deus Ex Machina. Opening the Drawer by typing drawer.open(myKey) clonedDocuments == true Duplicate the documents. Variable name: officeDrawer Empire State Building

Now to make a copy..." ]]> Lets break the task down into steps. 1)Create a variable 2)Get the documents from the drawer 3)clone these documents Like all Java objects, the documents have method clone(), which creates an exact copy These documents are private variables, and thus can't be taken directly. Luckily, type drawer has the method get Documents() which returns the documents officeDrawer.getDocuments().clone() will get you a clone of the documents. Without setting this to a variable saved in your program, you won't actually be able to do anything with these documents, however. Remember to save the cloned documents to a variable of the same type. [dripping sarcasm] I love doing your work. I'll type mDocs = drawer.getDocuments().clone() madeKeyCard > 0 Make a key card (which is not just a key, its of class KeyCard). You have the variable declared as Key keyOut. Empire State Building

" ]]> We need something that does everything a key does, but it also needs an electronic bar code. When a class definition has the word \"extends\" <class2> it inherits everything from class 2, then does more. Class KeyCard extends class Key. Class Poodle extends Class Dog. If I have a variable declared in the line Dog myDog; I can set that dog to an instance of poodle by saying myDog = new Poodle(); We will commence enhancing the truth in... all right, it's just easier to give you the truth. Solving this problem is as simple as getMeOutOfHere = new KeyCard(); var spyName = null; var authorizedPerson = "Hat guy"; var handleRotation = 0; var madeKey = 0; var madeKeyCard = 0; var clonedDocuments = false; var airlockPressure = 0; var zeppelinPressure = 30; var airlockCombo = new Array(4); airlockCombo[0] = 0; airlockCombo[1] = 0; airlockCombo[2] = 0; airlockCombo[3] = 0; function Drawer(lockCombo) { this.drawerOpen = undefined; this.lockCombo = lockCombo; } function open(key) { if(this.lockCombo == key.combo) { this.drawerOpen = true; } } function close() { this.drawerOpen = false; } function isOpen() { return this.drawerOpen == true; } Drawer.prototype.open = open; Drawer.prototype.close = close; Drawer.prototype.isOpen = isOpen; var officeDrawer = new Drawer(0); function Key() { combo = 0; lookEverybodyIMadeAKey(); } function lookEverybodyIMadeAKey() { madeKey = madeKey + 1; } function cut(combo) { this.combo = combo; } Key.prototype.cut = cut; KeyCard.prototype = new Key(); function KeyCard() { lookEverybodyIMadeAKeyCard(); } function lookEverybodyIMadeAKeyCard() { madeKeyCard = madeKeyCard + 1; } function Documents() { } function clone() { documentsCloned = true; } Documents.prototype.clone = clone;