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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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>[SERVER-47200] how to compare two NumberDecimal digits in javascript</title>
                <link>https://jira.mongodb.org/browse/SERVER-47200</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&#160;&lt;/p&gt;

&lt;p&gt;&#160; &#160; I am using map-reduce and in the map function I am trying to find out all objects with its value = or &amp;gt; or &amp;lt; a given decimal value. those objects are all NumberDecimal&#160; ones. note for some reason, I can&apos;t use aggregation operation.&lt;/p&gt;

&lt;p&gt;&#160; &#160; My question is:&#160; how can I compare two NumberDecimal digits in Javascripts? Does Mongo provide a function like compareTo() that I can use?&lt;/p&gt;

&lt;p&gt;&#160; &#160;&#160; e.g &#160;&#160;var X=new &lt;font color=&quot;#2b91af&quot;&gt;NumberDecimal&lt;/font&gt;(&quot;100&quot;);&lt;br/&gt;
&#160;&#160;&#160; var Y=new &lt;font color=&quot;#2b91af&quot;&gt;NumberDecimal&lt;/font&gt;(&quot;100.0&quot;);&lt;/p&gt;

&lt;p&gt; in JavaScript, X== Y is false.&lt;/p&gt;

&lt;p&gt; Perhaps I should converse the two to BigDecimal type and then do comparation? As I know, JavaScript doesn&apos;t have a native Decimal Type, and I have to use a library which define BigDecimal.&lt;/p&gt;

&lt;p&gt;Is it possible for to use this library in map-reduce operation? How should achieve this?&lt;/p&gt;

&lt;p&gt;by the way, I found the a lib who defines the bigDecimal : &lt;a href=&quot;https://github.com/royNiladri/js-big-decimal#readme&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/royNiladri/js-big-decimal#readme&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;but it requires me to install it like this: npm install --save js-big-decimal and then introduce it like this: var bigDecimal = require(&apos;js-big-decimal&apos;);&lt;/p&gt;

&lt;p&gt; but I think I can&apos;t install it in mongo server. &lt;/p&gt;

&lt;p&gt;it also suggest for web , I can do like this: &lt;/p&gt;

&lt;p&gt;&amp;lt;script src=&quot;node_modules/js-big-decimal/dist/web/js-big-decimal.min.js&quot;&amp;gt;&amp;lt;/script&amp;gt;&lt;/p&gt;

&lt;p&gt;but I don&apos;t think It is applicable for me.&lt;/p&gt;

&lt;p&gt;Is there any good suggestion for me to achieve my goal? Note I need to compare the two digits by &amp;lt;, =, and &amp;gt;.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1298068">SERVER-47200</key>
            <summary>how to compare two NumberDecimal digits in javascript</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="13204">Community Answered</resolution>
                                        <assignee username="dmitry.agranat@mongodb.com">Dmitry Agranat</assignee>
                                    <reporter username="winnie.wu@quest.com">winnie wu</reporter>
                        <labels>
                    </labels>
                <created>Tue, 31 Mar 2020 08:57:21 +0000</created>
                <updated>Fri, 27 Oct 2023 15:56:35 +0000</updated>
                            <resolved>Tue, 31 Mar 2020 12:26:45 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3018110" author="dmitry.agranat" created="Tue, 31 Mar 2020 12:26:17 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=winnie.wu%40quest.com&quot; class=&quot;user-hover&quot; rel=&quot;winnie.wu@quest.com&quot;&gt;winnie.wu@quest.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Being able to compare different decimal128 values to each other has come up for testing the database as well. We use the &lt;tt&gt;bsonWoCompare(obj1, obj2)&lt;/tt&gt; function that&apos;s available in mongo shell to do so. That same function is also available in the server-side JavaScript environment with &lt;tt&gt;$where&lt;/tt&gt; and &lt;tt&gt;mapReduce&lt;/tt&gt;. It will return&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;1 if &lt;tt&gt;obj1 &amp;gt; obj2&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;0 if &lt;tt&gt;obj1 = obj2&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;-1 if &lt;tt&gt;obj1 &amp;lt; obj2&lt;/tt&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Some examples:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; bsonWoCompare({_: NumberDecimal(&quot;100&quot;)}, {_: NumberDecimal(&quot;100.0&quot;)})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; bsonWoCompare({_: NumberDecimal(&quot;100.0&quot;)}, {_: NumberLong(&quot;100&quot;)})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; bsonWoCompare({_: NumberDecimal(&quot;99.999999&quot;)}, {_: NumberDecimal(&quot;99.999&quot;)})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Note that if you&apos;re using a recent version of MongoDB (4.0.4 or later), then you don&apos;t actually need to wrap the values in {&lt;tt&gt;_: &amp;lt;value&amp;gt;&lt;/tt&gt;} objects as a result of the changes from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30773&quot; title=&quot;bsonWoCompare and bsonBinaryEqual should work with bsonelement types&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30773&quot;&gt;&lt;del&gt;SERVER-30773&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The SERVER project is for bugs and feature suggestions for the MongoDB server. As this ticket does not appear to be a bug, I will now close it. If you need further assistance troubleshooting, I encourage you to ask our community by posting on the &lt;a href=&quot;http://community.mongodb.com&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB Community Forums&lt;/a&gt; or on &lt;a href=&quot;https://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Dima&lt;/p&gt;</comment>
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