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Programming Ruby The Pragmatic Programmer's Guide |
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class FalseClass
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Parent:
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Object
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Version:
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1.6
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Index:
&
^
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The global value false is the only instance of class FalseClass and represents a logically false value in boolean
expressions. The class provides operators allowing false
to participate correctly in logical expressions.
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instance methods
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&
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false & anObject
-> false
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And---Returns false. anObject is always
evaluated as it is the argument to a method call---there is no
short-circuit evaluation in this case.
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^
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false ^ anObject
-> true or false
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Exclusive Or---If anObject is nil or false, returns false; otherwise, returns true.
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false | anObject
-> true or false
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Or---Returns false if anObject is nil or false; true otherwise.
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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.
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