t

t Constant Variable

Constant Value:

t.

Description:

The boolean representing true, and the canonical generalized boolean representing true. Although any object other than nil is considered true, t is generally used when there is no special reason to prefer one such object over another.

Data and Control

The symbol t is also sometimes used for other purposes as well. For example, as the name of a class, as a designator (e.g., a stream designator ) or as a special symbol for some syntactic reason (e.g., in case and typecase to label the otherwise-clause).

Examples:

t → T 
(eq t ’t) → true 
(find-class ’t) → #<CLASS T 610703333> 
(case ’a (a 1) (t 2)) → 1 
(case ’b (a 1) (t 2)) → 2 
(prin1 ’hello t) 
▷ HELLO 
→ HELLO 

See Also:

nil

Expanded Reference: t

tip

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