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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-1345] mapReduce Allowed Functions Information</title>
                <link>https://jira.mongodb.org/browse/DOCS-1345</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Looking through the list of functions and objects permitted for use (as laid out in the &quot;Notes: Changed in MongoDB 2.4&quot; box),&lt;br/&gt;
I can&apos;t find the reference material for &lt;em&gt;any&lt;/em&gt; of the allowed functions in the map/reduce engine.  For example, a search for assert() from the search box finds 133 items, &lt;b&gt;none&lt;/b&gt; of which actually document the assert() function (at least, none of them start with the word &quot;assert&quot;).&lt;/p&gt;

&lt;p&gt;That&apos;s just the first of the 30 or so functions. Even &quot;Map()&quot; has the same problem.  These mostly aren&apos;t &quot;core javascript&quot; functions; AFAICT, they all have dozens of implementations on the web, many with different calling sequences and behaviors.&lt;/p&gt;

&lt;p&gt;Is there some place in the documentation that says which JS libraries this engine is built on, at least?  It would be better, of course, if those function names were links.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Reporter&lt;/b&gt;: Rick Cobb&lt;br/&gt;
&lt;b&gt;E-mail&lt;/b&gt;: &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;mailto:cobbr2@yahoo.com&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cobbr2@yahoo.com&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/mail_small.gif&quot; height=&quot;12&quot; width=&quot;13&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;</description>
                <environment>&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/method/db.collection.mapReduce/&quot;&gt;http://docs.mongodb.org/manual/reference/method/db.collection.mapReduce/&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.43 Safari/537.31&lt;br/&gt;
*Referrer*: &lt;a href=&quot;https://www.google.com/&quot;&gt;https://www.google.com/&lt;/a&gt;&lt;br/&gt;
*Screen Resolution*: 1920 x 1080&lt;br/&gt;
*repo*: docs&lt;br/&gt;
*source*: reference/method/db.collection.mapReduce&lt;br/&gt;
</environment>
        <key id="70898">DOCS-1345</key>
            <summary>mapReduce Allowed Functions Information</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="auto">auto</reporter>
                        <labels>
                            <label>collector-298ba4e7</label>
                    </labels>
                <created>Fri, 5 Apr 2013 17:17:03 +0000</created>
                <updated>Mon, 30 Oct 2023 22:32:44 +0000</updated>
                            <resolved>Wed, 27 Jul 2016 17:38:49 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1337979" author="emily.hall" created="Wed, 27 Jul 2016 17:38:49 +0000"  >&lt;p&gt;Closed for housekeeping on 7/27/2016 by Emily Hall. &lt;br/&gt;
If you require additional support, please open a new ticket for prioritization. &lt;br/&gt;
Thanks,&lt;br/&gt;
Emily&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="70595">DOCS-1332</issuekey>
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