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The result variable is a variable used by AppleScript to store the result of the last command that ran. This value of the result, if needed by the scripter, is usually assigned to another variable as well, making the result variable itself redundant.
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10. Run the script, and see what happens you should get a result along the lines of the following: folder "untitled folder" of folder "Desktop" of folder "hanaan" of folder "Users" of startup disk
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CHAPTER 2 SCRIPTING FROM THE GROUND UP
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This is what s called a reference, which is how you can point to a file when scripting the Finder and other applications. Although this will work now, as soon as you run the line that changes the name of the folder, this reference is useless. It s a bit like telling someone whom you ve never met before that you are going to be the guy with the beard and then going and shaving it off! You are still you, but the description you gave is no good. 11. To get a more lasting hold on your file, you can use the alias data type. Change the last line to this: set my_folder to the result as alias 12. Now run the script again, and you should see the following returned: alias "Macintosh HD:Users:hanaan:Desktop:untitled folder:" Any subsequent time you run the script, the resulting folder s name will be untitled folder 2, untitled folder 3, and so on. This name difference will be reflected in the result of the script as well. This unique way to point to a file works much like aliases in the Finder: it knows what file you re talking about even if it has been moved or renamed! This will come in handy. 13. Let s talk to the Finder again add the following sixth line: tell application "Finder" to set the name of my_folder to folder_name What you have done here is to use the two variables you collected earlier in the script, folder_name and my_folder, to rename the folder you created. 14. Now enter the following line this seventh line will create a dialog box to ask the user whether they want the folder deleted: display dialog ("Delete new folder "& folder_name & " ") buttons {"Yes", "No"} The display dialog command has a few optional parameters. You will use the command s direct parameter to denote the dialog box s text and its buttons parameter to specify the button labels. By default a dialog box has two buttons: OK and Cancel.
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You put the "Delete new folder "& folder_name &" " operation in parentheses in this exercise. Although you didn t have to, it keeps your code a little more human readable. In other cases, using parentheses will change the outcome of an operation. Also note that the result of the dialog box is a record. We won t get into records now, but for now you just need to know that you can find out what button the user clicked from that record and then use that information elsewhere in your code.
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15. The next few lines look inside the dialog box result to determine whether the user clicked Yes or No and act accordingly. Add these lines to the bottom of the script: if button returned of result is "Yes" then tell application "Finder" to delete my_folder end if Notice that the alias value stored in the variable my_folder knows what folder you mean even though the folder s name was changed earlier. The script should now look like the one in Figure 2-3.
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CHAPTER 2 SCRIPTING FROM THE GROUND UP
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Figure 2-3. The script so far
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More Results with Less Talk
Let s discuss again the way AppleScript relates to expressions and results. You know that almost every line has a result that can be captured. This is because most lines contain expressions that return results. A statement can contain a single expression or multiple expressions. For instance, you can write the following: set set set set x to 3 + 4 y to x * 5 z to y 37 final_number to z / 15
or you can make it a more math-like operation and write this: set final_number to (((3 + 4) * 5) 37) / 15 You can perform the same operation by using the result variable instead of creating your own variables: 3 + 4 result * 5 result 37 set final_number to result / 15
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