Programming Ruby: The Pragmatic Programmer's Guide

The Pragmatic Programmer's Guide

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class FalseClass

Parent:	Object
Version:	1.6

Index:

& ^ |

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.

instance methods
&	`false` & anObject -> `false`
	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.
^	`false` ^ anObject -> `true` or `false`
	Exclusive Or---If anObject is `nil` or `false`, returns `false`; otherwise, returns `true`.
\|	`false` \| anObject -> `true` or `false`
	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/)).

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