January 2006
Beginner
592 pages
16h 55m
English
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Boolean
A boolean
is a datatype consisting of exactly two possible values: true
and false
. The main use for a boolean is as a condition in a control statement, such as if or repeat while (see Chapter 19). It often appears also as a way of setting yes-or-no options in a command; for example, the choose file command (discussed in Chapter 21) lets you submit a boolean to indicate whether invisible files and folders should be displayed. Some common commands, such as exists, return a boolean. AppleScript has a number
of operators that generate or combine booleans (listed in Chapter 15).
class of true -- boolean class of (1 < 2) --boolean
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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.