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601 B
601 B
Booleans
Racket has two distinguished constants to represent boolean values: #t
for true and #f for false. Uppercase #T and #F are parsed as the
same values, but the lowercase forms are preferred.
The boolean? procedure recognizes the two boolean constants. In the
result of a test expression for if, cond, and, or, etc.,
however, any value other than #f counts as true.
Examples:
> (= 2 (+ 1 1))
#t
> (boolean? #t)
#t
> (boolean? #f)
#t
> (boolean? "no")
#f
> (if "no" 1 0)
1