Programming Ruby
The Pragmatic Programmer's Guide
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.
Extracted from the book "Programming Ruby -
The Pragmatic Programmer's Guide"
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