|
class TrueClass
|
|
Parent:
|
Object
|
|
Version:
|
1.6
|
|
Index:
&
^
|
The global value
true is the only instance of class
TrueClass and represents a logically true value in boolean
expressions. The class provides operators allowing
true
to be used in logical expressions.
|
instance methods
|
|
&
|
true & anObject
-> anObject
|
|
And---Returns false if anObject is nil or
false, true otherwise.
|
|
^
|
true ^ anObject
-> !anObject
|
|
Exclusive Or---Returns true if
anObject is nil or false,
false otherwise.
|
|
|
|
true | anObject
-> true
|
|
Or---Returns true. As anObject is an
argument to a method call, it is always evaluated; there is no
short-circuit evaluation in this case.
true | puts("or")
true || puts("logical or")
|
produces:
|
Extracted from the book "Programming Ruby -
The Pragmatic Programmer's Guide"
Copyright
©
2001 by Addison Wesley Longman, Inc. This material may
be distributed only subject to the terms and conditions set forth in
the Open Publication License, v1.0 or later (the latest version is
presently available at
http://www.opencontent.org/openpub/)).
Distribution of substantively modified versions of this document is
prohibited without the explicit permission of the copyright holder.
Distribution of the work or derivative of the work in any standard
(paper) book form is prohibited unless prior permission is obtained
from the copyright holder.
