Programming Ruby: The Pragmatic Programmer's Guide

# Programming Ruby ### 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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