From b1605ef9a7f21e7caf3d033b5ac7df0b8da5c3fe Mon Sep 17 00:00:00 2001
From: Leah Neukirchen <leah@vuxu.org>
Date: Fri, 18 Nov 2022 19:55:47 +0100
Subject: add xfold, xfold-right, xreduce, xreduce-right, xscan, xscan-right

Make scan, scan-right work with multiple lists.
---
 mew.svnwiki | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'mew.svnwiki')

diff --git a/mew.svnwiki b/mew.svnwiki
index f11e5d6..c10a557 100644
--- a/mew.svnwiki
+++ b/mew.svnwiki
@@ -253,6 +253,19 @@ Returns true if {{<va>}} is an unspecified value, else false.
 <procedure>(scan-right <kons> <knil> <lists>...)</procedure>
 
 Like {{fold}}/{{fold-right}}, but collects all accumulator values.
+Prefer {{xscan}}/{{xscan-right}}.
+
+<procedure>(xfold <kons> <knil> <lists>...)</procedure>
+<procedure>(xfold-right <kons> <knil> <lists>...)</procedure>
+<procedure>(xreduce <kons> <knil> <lists>...)</procedure>
+<procedure>(xreduce-right <kons> <knil> <lists>...)</procedure>
+<procedure>(xscan <kons> <knil> <lists>...)</procedure>
+<procedure>(xscan-right <kons> <knil> <lists>...)</procedure>
+
+Like {{fold}}/{{fold-right}}/{{reduce}}/{{reduce-right}}/{{scan}}/{{scan-right}},
+but {{<kons>}} always takes the accumulator as first arguments,
+and the items after.  This is more practical when multiple {{lists}}
+are passed.
 
 <syntax>(imp <antedecent>... <consequent>)<syntax>
 
-- 
cgit 1.4.1