Chapter 13

Other Built-In Objects


Other Built-In Objects

Dylan contains a small number of predefined unique program constants, described below.

#t [<boolean>]


The canonical true value.

#f [<boolean>]


The false value.

$permanent-hash-state [<object>]


A hash state that is always valid.

This is an implementation-dependent hash state that indicates that the associated hash id is always valid, and does not depend on any mutable property of the object that can be changed without a visible modification to the object.

#() [<empty-list>]


The empty list.