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Source for wiki CompleteSequenceCowan version 8

author

cowan

comment

ipnr

74.68.121.27

name

CompleteSequenceCowan

readonly

0

text

The WG1 charter says "Self consistency is an important objective, which may require adding new features."  Scheme has three sequence types: lists, strings, and vectors, but the support for them is not consistent.  Lists have the most support, strings and vectors have much less, and inconsistently so.  I propose providing the following procedures, some of which are R5RS, some R6RS, some in various SRFIs, and some new:

||Type of procedure||Lists||Strings||Vectors||
||Basic constructor||`make-list` (SRFI 1)||`make-string`||`make-vector`||
||Variadic constructor||`list`||`string`||`vector`||
||Copy constructor||`list-copy` (SRFI 1)||`string-copy`||`vector-copy` (SRFI 43)||
||Mutating copier||`list-copy!` (SRFI 1)||`string-copy!` (SRFI 13)||`vector-copy!` (SRFI 43)||
||Basic predicate||`list?`||`string?`||`vector?`||
||Sequence length||`length`||`string-length`||`vector-length`||
||Element access||`list-ref`||`string-ref`||`vector-ref`||
||Element mutator||`list-set!` (proposed)||`string-set!`||`vector-set!`||
||Map function||`map`||`string-map` (SRFI 13 extended)||`vector-map` (R6RS)||
||Map side effects||`for-each`||`string-for-each` (proposed)||`vector-for-each` (R6RS)||
||Append||`append`||`string-append`||`vector-append` (SRFI 43)||
||Fill||---||`string-fill!`||`vector-fill!`||
||Convert to list||---||`string->list`||`vector->list`||
||Convert to string||`list->string`||---||`vector->string` (proposed)||
||Convert to vector||`list->vector`||`string->vector` (proposed)||---||


In summary: 45 procedures, 27 in R5RS, 2 in R6RS, 2 in SRFI 1, 2 in SRFI 43, 1 in SRFI-13 but extended to take multiple strings, 4 novel but obvious.

I further propose that the "map function" and "map side effects" groups should be specified to implicitly truncate all sequence arguments to the length of the shortest sequence.

time

2012-12-18 12:27:31

version

8