(couchdb) 01/01: Document another incompatibility between SM 1.8.5 and 78+

[va...@apache.org]

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vatamane pushed a commit to branch doc-more-monkey-incompat
in repository https://gitbox.apache.org/repos/asf/couchdb.git

commit 5db3dca149f867426cca20b44fcc1e43c217bf1a
Author: Nick Vatamaniuc <va...@gmail.com>
AuthorDate: Tue Oct 8 12:21:33 2024 -0400

    Document another incompatibility between SM 1.8.5 and 78+
    
    This is gnarly as this is something a user might put in a filter function, so
    they'd start getting unexpected results after the upgrade.
    
    ```
    % js
    js> "abc".match(undefined)
    null
    
    % js91
    js> "abc".match(undefined)
    [""]
    ```
---
 src/docs/src/best-practices/jsdevel.rst | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/docs/src/best-practices/jsdevel.rst b/src/docs/src/best-practices/jsdevel.rst
index 73cf0021d..cda39b36e 100644
--- a/src/docs/src/best-practices/jsdevel.rst
+++ b/src/docs/src/best-practices/jsdevel.rst
@@ -209,6 +209,21 @@ Spidermonkey 91 output also match QuickJS and v8.
    js> r={}; ["Xyz", "abc", 1].forEach(function(v) {r[v]=v;}); Object.keys(r)
    ["1", "Xyz", "abc"]
 
+7. String ``match(undefined)``
+
+   Spidermonkey 1.8.5 returns ``null`` for ``match(undefined)`` while versions
+   starting with at least ``78`` return ``[""]``.
+
+.. code-block:: bash
+
+   % js
+   js> "abc".match(undefined)
+   null
+
+   % js91
+   js> "abc".match(undefined)
+   [""]
+
 Using QuickJS
 =============