June 2001
Intermediate to advanced
526 pages
16h 29m
English
Content preview from AppleScript in a NutshellBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Name
( )
Syntax
35 - (15 + 42)
Return value
The result of the expression that is stored within the parentheses, which can be any valid AppleScript expression, identifier, or return value from a subroutine or command.
Description
Using parentheses with expressions forces the parenthetical operation to be evaluated first, hopefully producing the result you intended. The syntax example that begins this section would produce 62 if the parentheses were not there (35 - 15 + 42), whereas with the parentheses the result is -22. Each nested parenthetical expression is evaluated before any outer parenthetical expressions are evaluated.
To a lesser extent, the use of parentheses makes complex statements more readable, even if the placement of the parentheses does not change the result of the expression.
Examples
35.6 * (7 / (round realVar)) (* a complex expression, including
the 'round' scripting addition, looks a little clearer when parentheses are
used, even though the result is the same compared with leaving the parentheses
out *)
set herReply to (display dialog¬
"Do you love me?" default answer¬
"Of course I do!" buttons {"answer him", "cancel affair"}) (* use parentheses
to encapsulate, at least visually, the return value from a scripting-addition
command (these parentheses are not strictly necessary) *)Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.