Section 12.7. Creating References to Variables


12.7. Creating References to Variables

You can't make a reference to a local variable. Well, you can, but if you try to use it you'll get a mysterious error. For example:

 local x set x to {1, 2, 3} set y to a reference to x get item 1 of y -- error: Can't make item 1 of x into type reference

But a reference can itself be stored in a local variable:

 local y set x to {1, 2, 3} set y to a reference to x get item 1 of y -- 1

You can make a reference to anything that isn't a local, such as a global or a top-level entity:

 script myScript     property x : 5     set y to a reference to x     set contents of y to y + 1     display dialog x end script run myScript -- 6

That works just as well from outside of the script object:

 script myScript     property x : 5     display dialog x end script tell myScript     set y to a reference to its x     set contents of y to y + 1     run -- 6 end tell




AppleScript. The Definitive Guide
AppleScript: The Definitive Guide, 2nd Edition
ISBN: 0596102119
EAN: 2147483647
Year: 2006
Pages: 267
Authors: Matt Neuburg

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