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The result variable is the most often updated and most used variable in AppleScript. After evaluating all the expressions within a statement, AppleScript assigns the final result to the result variable. In practical terms, this means the result of any line of code that whose expression produces a result will have that resulting value assigned to the result variable. Examine the simple statement in the script in Figure 8-12. Line 1 of the script in Figure 8-12 contains a simple mathematical expression that isn t assigned to any specific variable it is simply expressed into the air. But, thanks to the result variable, the value it returns is safe. The value 6 that was returned from the expression in line 1 was put in the result variable. Line 2 retrieves the value of the result variable and shows that it is 6.
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CHAPTER 8 WORKING WITH VARIABLES
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Figure 8-12. The result variable is assigned the value returned by the expression 2 + 4 in the previous statement.
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Destroying Variables
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Generally, the AppleScript Language Guide does not recommend or explain any way to completely get rid of variables. The way to do that is by creating a small handler that returns no value, as shown in Script 8-13. Script 8-13. to destroy_variable() return end destroy_variable To use the handler to actually destroy a variable, you need to set the variable to the result of this subroutine, as follows: set variable_i_no_longer_want to destroy_variable() Figure 8-13 shows the complete variable-killer script, and Figure 8-14 shows the error that follows its execution.
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Technically, this hack doesn t destroy a variable; it merely assigns no value to it. Also, it s rarely useful but possible nonetheless.
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CHAPTER 8 WORKING WITH VARIABLES
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Figure 8-13. The variable-killer script
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Figure 8-14. The error generated by running the script in Figure 8-13
Power Wrap-Up
The following sections summarize the chapter in an intensive reference style. Use these sections to look up facts related to the chapter without the chatter.
Declaring Variables
You can declare variables explicitly or implicitly. To implicitly declare a variable, just assign a value to it. The two statements that follow use two different commands to assign a string value to a variable whose identifier is my_variable: set my_variable to "the value" copy "the value" to my_variable
CHAPTER 8 WORKING WITH VARIABLES
Using Properties
Properties are variables that are normally declared at the top of a script. You have to assign a value to a property right from the start: property identifier_name : "initial value" The value of a property is available throughout the script, including inside all subroutines, and is retained even between script runs.
Using Global Variables
Much like properties, global variables are normally declared at the top of a script. You don t supply them with an initial value, and you can declare multiple global variables with one statement: global identifier_1, identifier_2, identifier_3 Once the value of a global variable has been set, it will be available throughout the script, including all subroutines, and will come back even between script runs.
Using Local Variables
Any variables you created and did not declare as either a global variable or a property are local variables by default. The value of a local variable is available only inside the handler in which it was defined. To use the value of a local variable in another handler, you must pass it as a parameter. Explicitly declaring local variables is not necessary but is good practice: on run local identifier_1, identifier_2 --statements end run
Naming Variables
The basic variable naming rules are as follows: An identifier must start with a letter (A Z, a z) or an underscore (_) and may contain (after the first character) any alphanumeric character (A Z, a z, 0 9) or underscore. An identifier can t start with a digit or contain spaces, dashes, or any other nonalphanumeric characters. An identifier can t be a reserved word. You will know right away if it is by looking at the compiled script s syntax coloring, if the script compiles at all. An identifier can t have the same name as a handler identifier in the same script. Use straight lines (pipes) at the start and end of a variable identifier, and you can break all the rules: set |123 GO! Yes, this is a legal variable!| to "string value"
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