Hi, 

    I am using map-reduce and in the map function I am trying to find out all objects with its value = or > or < a given decimal value. those objects are all NumberDecimal  ones. note for some reason, I can't use aggregation operation.

    My question is:  how can I compare two NumberDecimal digits in Javascripts? Does Mongo provide a function like compareTo() that I can use?

     e.g   var X=new NumberDecimal("100");
    var Y=new NumberDecimal("100.0");

in JavaScript, X== Y is false.

Perhaps I should converse the two to BigDecimal type and then do comparation? As I know, JavaScript doesn't have a native Decimal Type, and I have to use a library which define BigDecimal.

Is it possible for to use this library in map-reduce operation? How should achieve this?

by the way, I found the a lib who defines the bigDecimal : https://github.com/royNiladri/js-big-decimal#readme

but it requires me to install it like this: npm install --save js-big-decimal and then introduce it like this: var bigDecimal = require('js-big-decimal');

but I think I can't install it in mongo server.

it also suggest for web , I can do like this:

<script src="node_modules/js-big-decimal/dist/web/js-big-decimal.min.js"></script>

but I don't think It is applicable for me.

Is there any good suggestion for me to achieve my goal? Note I need to compare the two digits by <, =, and >.