Scheme Request for Implementation 227,
"Optional Arguments,"
by Marc Nieper-Wißkirchen (spec and R6RS implementation) and Daphne Preston-Kendal (R7RS implementation),
has gone into final status.
The document and an archive of the discussion are available at <
https://srfi.schemers.org/srfi-227/>.
Here's the abstract:
This SRFI specifies the opt-lambda syntax, which generalizes lambda.
An opt-lambda expression 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 to
opt-lambda as let* is to let and the related binding constructs
let-optionals and let-optionals*.
Finally, for those who prefer less explicit procedure definitions, a
sublibrary provides define-optionals and define-optionals*.
Here is the commit summary since the most recent draft:
- Mention define-optionals(*) in the abstract.
- Update abstract.
- copy edits
- Finalize.
Here are the diffs since the most recent draft:
<
https://github.com/scheme-requests-for-implementation/srfi-227/compare/draft-2..final>
Many thanks to Marc and to everyone who contributed to the discussion of
this SRFI.
Regards,
SRFI Editor
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