Programming Ruby

The Pragmatic Programmer's Guide

Previous < Contents ^
Next >
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.


Previous < Contents ^
Next >

Extracted from the book "Programming Ruby - The Pragmatic Programmer's Guide"
Copyright © 2000 Addison Wesley Longman, Inc. Released under the terms of the Open Publication License V1.0.
This reference is available for download.