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OK, so now that you ve recited all the rules and know them perfectly, I ll give you the invisibility cloak that will allow you to bypass all those rules! Use spaces, start with a number, and use reserved words anything you want! All you have to do is wrap your identifier in a pair of pipes, like this: |my variable| This shields the variable from any naming rules. Doing this allows you to use spaces, use special characters, start the name with a number (inside the pipes), and so on. Here are some legal names: |#$%@ That!| | | |2b or not 2b| When AppleScript decompiles a previously compiled script to source code, it will automatically apply pipes to an identifier if that identifier would otherwise conflict with an application or scripting addition defined keyword.

So far you know that assigning a value to a variable allows you to retrieve that value later. That is true to some extent, but as your scripts become more sophisticated, you will need to understand where variables are useful, why they re useful, and for how long they re useful. As stated earlier in the chapter, when you simply assign a value to a variable, you are actually getting AppleScript to perform two actions: declaring the variable and assigning a value to it. The variable that was created, however, has been declared as a local variable, by default.

Figure 1-3. Original text contents of the h2 element We can see that currently, the h2 element displays the text Using jQuery. This isn t what we want yet, so let's look at two ways of solving our problem and changing the contents using jQuery code.

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Local variables are simple to understand until you start creating your own handlers. Once handlers enter the scene, you must also consider the scope of the variables that is, which parts of the script can see them. Examine Script 8-2 to better understand what I mean: Script 8-2. set user_name to "Ben" display dialog ("Hello " & user_name & "!") When you run the script, AppleScript displays the dialog box shown in Figure 8-2.

Figure 26-3. The modified LOOP program Now, it wasn t that difficult to modify the program, but imagine if this program is getting larger and larger, with SPOT needing to perform not only left turns but right turns. The

Figure 8-2. Hello Ben! dialog box Line 1 of the script declared the local variable user_name and then assigned the value "Ben" to it. Line 2 created a dialog box displaying the value stored in the variable so far, so good. What you ll do now is put the display dialog statement from line 2 in the preceding script into a subroutine. Script 8-3 shows what it looks like. Script 8-3. set user_name to "Ben" say_hello() on say_hello() display dialog ("Hello " & user_name & "!") end say_hello The subroutine is declared between lines 3 and 5. It is called to action on line 2. If you try to run the preceding script, you will get the error shown in Figure 8-3.

text(text)

Figure 8-3. Apparently, the variable user_name has not been declared. So, what went wrong You specifically assigned a value to the user_name variable in line 1, so why did line 4 raise the error it did This is because the local variable was visible in the body of the script but not to the code inside the say_hello handler. The scope of a local variable since you didn t specify otherwise, user_name is a local variable is the current handler only.

What handler is that exactly It s the run handler. The lines that declare (start and end) the run handler can be left out, but even without the declaration, any code that is not a property or a handler is part of the implied run handler. The script could have explicitly specified the run handler, as shown in Figure 8-4.

Now we will make use of the text(text) method to change the contents of the h2 element on the fly. $(document).ready(function() { $('h2').text('JavaScript Libraries'); });

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