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Concatenating Other Value Classes
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Concatenating operands of value classes other than a string, list, or record produces a list with two items: the left operand and the right operand. In the following code, the concatenation operator appears with two date values. The result is a list with the two dates in it. (current date) & (current date) --> {date "Saturday, October 25, 2003 10:35:30 AM", date "Saturday, October 25, 2003 10:35:30 AM"}
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Understanding the a reference to Operator
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The a reference to operator allows you to turn a literal reference that identifies a property or element(s) of a particular object into a reference value that can be assigned to variables and passed to and from subroutines just like any other value.
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CHAPTER 9 INTRODUCING OPERATIONS AND COERCION
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Usually when AppleScript evaluates a literal reference, it immediately retrieves the value from the location: set my_rec to {name: "John", age: 18} set my_age to age of my_list --> 18 tell application "Finder" set the_disks to every disk end tell --> {startup disk of application "Finder", disk "Backup" of application "Finder"} Most of the time this is what you want, but occasionally it s useful to specify a reference at one point in a script without resolving the reference until later. A common example where this happens automatically is AppleScript s repeat with...in... loop, where the loop variable is assigned a reference to each list item in turn. This allows the code within the loop to not only obtain each item in the list but also to replace that item with a new value if it wants: set the_list to {1, 2, 4, 5} repeat with number_ref in the_list set contents of number_ref to contents of number_ref * 2 end repeat the_list --> {2, 4, 8, 10} However, you can also create your own reference values by placing the a reference to operator in front of a literal reference: set my_rec to {name: "John", age: 18} set my_age_ref to a reference to age of my_rec --> age of {name:"John", age:18} tell application "Finder" set the_disks_ref to a reference to every disk end tell --> every disk of application "Finder" To obtain the current value of the referenced location, just ask the reference for the value of its contents property: set my_age to contents of my_age_ref --> 18 set the_disks to contents of the_disks_ref --> {startup disk of application "Finder", disk "Backup" of application "Finder"} Similarly, to replace the value at the referenced location with a new value, assign a new value to the reference s contents property: set contents of my_age_ref to 19 get my_rec --> {name: "John", age: 19} Should the original value change at some point, then the new value will be returned the next time you get the reference s contents: tell application "Finder" to eject (every disk whose ejectable is true) get contents of the_disks_ref --> {startup disk of application "Finder"}
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CHAPTER 9 INTRODUCING OPERATIONS AND COERCION
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The a reference to operator can be useful when you want to assign a reference for an application object to a variable for later use. With some applications, it s fine just to use the reference returned by the application: tell application "Finder" set source_folder to folder "Movies" of home end tell --> folder "Movies" of folder "Hanaan" of folder "Users" of startup disk of application "Finder" A reference that identifies elements by name or ID should be quite reliable over time. Some applications, however, return references that identify elements by position. For example, in Script 9-3, say you d like to set variable my_layer to a specific layer in an Adobe Illustrator document. Script 9-3. tell application "Adobe Illustrator CS2" set my_layer to layer "images" of document "brochure.ai" end tell --> layer 1 of document 1 of application "Adobe Illustrator CS2" As you can see, AppleScript takes the original by name reference on line 2 and immediately sends it to Illustrator, which trades it for a less precise by index reference. If you ll be moving documents or layers, then this sort of reference isn t desirable because it could easily end up identifying a completely different object than the one you want. This script would be much more reliable if you could keep the original, more precise by name reference and always use that. Thanks to the a reference to operator, you can. Script 9-4 shows how. Script 9-4. tell application "Adobe Illustrator CS2" set my_layer to a reference to layer "images" of document "brochure.ai" end tell --> layer "images" of document "brochure.ai" of application "Adobe Illustrator CS2" Now, instead of immediately asking Illustrator to get layer "images" of document "brochure.ai", line 2 assigns the original reference directly to the my_layer variable. The script can use this reference later just like it would any other reference. The only difference is that it ll be more reliable than the one Illustrator would have given you otherwise.
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