From: Kevin Ryde <user42@zip.com.au>
Subject: doco srfi-1 count
Date: Thu, 01 May 2003 10:48:41 +1000 [thread overview]
Message-ID: <873cjzcx06.fsf@zip.com.au> (raw)
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I noticed "count" from srfi-1 doesn't appear in the manual. Assuming
that's only an accidental ommision I thought to propose the addition
below.
* srfi-modules.texi (SRFI-1 Length Append etc): Add count.
What's described is per the srfi-1 spec, but the words are by me. For
ease of reading the text is:
- Scheme Procedure: count pred lst1 ... lstN
Return a count of the number of times PRED returns true when
called on elements from the given lists.
PRED is called with N parameters `(PRED ELEM1 ... ELEMN)', each
element being from the corresponding LST1 ... LSTN. The first
call is with the first element of each list, the second with the
second element from each, and so on.
Counting stops when the end of the shortest list is reached. At
least one list must be non-circular.
[-- Attachment #2: srfi-modules.texi.count.diff --]
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--- srfi-modules.texi.~1.8.~ 2002-08-06 04:52:27.000000000 +1000
+++ srfi-modules.texi 2003-05-01 10:41:46.000000000 +1000
@@ -381,6 +381,20 @@
containing the second elements of each lists, and so on.
@end deffn
+@deffn {Scheme Procedure} count pred lst1 ... lstN
+Return a count of the number of times @var{pred} returns true when
+called on elements from the given lists.
+
+@var{pred} is called with @var{N} parameters @code{(@var{pred}
+@var{elem1} @dots{} @var{elemN})}, each element being from the
+corresponding @var{lst1} @dots{} @var{lstN}. The first call is with
+the first element of each list, the second with the second element
+from each, and so on.
+
+Counting stops when the end of the shortest list is reached. At least
+one list must be non-circular.
+@end deffn
+
@node SRFI-1 Fold and Map
@subsection Fold, Unfold & Map
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