status: final (2021-11-16)
keywords: BindingSee also SRFI 89: Optional positional and named parameters.
This SRFI specifies the
opt-lambda syntax, which
evaluates to a procedure that takes a number of required and a number of
optional (positional) arguments whose default values are determined by
evaluating corresponding expressions when the procedure is called.
This SRFI also specifies a variation
opt*-lambda, which is
let* is to
and the related binding constructs
Finally, for those who prefer less explicit procedure
definitions, a sublibrary provides