Ticket 436: Formal Comment: Generalization of append, map, and for-each to other sequences

Formal Comment

Submitter's name: Marc Feeley Submitter's email: feeley at iro.umontreal.ca Relevant draft: r7rs draft 6

Type: defect Priority: major Relevant section of draft: 6.7. Strings, 6.8. Vectors, 6.9. Bytevectors, 6.10. Control features

Summary: Generalization of append, map, and for-each to other sequences

R7RS has three vector-like data types: strings, vectors and bytevectors.

The procedure

(string-append string ...)

exists to concatenate strings, like append concatenates lists. However there is no vector-append and bytevector-append which concatenate vectors and bytevectors.

The procedures

(string-map proc string1 string2 ...) (vector-map proc vector1 vector2 ...)

(string-for-each proc string1 string2 ...) (vector-for-each proc vector1 vector2 ...)

are for strings and vectors what map and for-each are for lists. There is no such procedures for bytevectors.

For consistency, these missing procedures should be added.