6.4 Booleans ¶

Builtin Class: <boolean> ¶

A boolean class. Only #t and #f belong to this class.

Function: not obj ¶

[R7RS base] Returns #t if and only if obj is #f, and returns #f otherwise.

Function: boolean? obj ¶

[R7RS base] Returns #t if obj is a boolean value.

Function: boolean obj ¶

[SRFI-235] Returns #f iff obj is #f, and returns #t otherwise. Convenient to coerce a value to boolean.

Function: boolean=? a b c … ¶

[R7RS base] Every argument must be a boolean value. Returns #t iff all values are the same, #f otherwise.