# Linq.js for Dynamics 365 Developers
Recently I was working in some large JSON objects in client side javascript where I had to query through it several times as per requirement I was using [javascript array’s functions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/prototype). Then I thought why not use [lodash.js](https://github.com/lodash/lodash/) or [underscore.js](https://github.com/jashkenas/underscore) I checked over github they are really feature rich and trustworthy, but there was a whole new list of functions and syntax to learn.
Then after few more google search I got sevearal [javascript libraries with LINQ like syntax](https://dzone.com/articles/5-linq-javascript-libraries), after comparing I found [linq.js](https://github.com/mihaifm/linq) most promising and even size is lesser when comparing to lodash and underscore.
Library
GZipped size
lodash
~ 24 KB
**linq.js**
**~ 7 KB**
underscore
~ 6.6 KB
> linq.js github project link -> [https://github.com/mihaifm/linq](https://github.com/mihaifm/linq)
With Linq.js dynamics 365 developers can use their existing knowledge of LINQ in javascript code whith nominal changes. see below examples from their github
// C# LINQ - delegate
Enumerable.Range(1, 10)
.Where(delegate(int i) { return i % 3 == 0; })
.Select(delegate(int i) { return i * 10; });
// linq.js - anonymous function
Enumerable.range(1, 10)
.where(function(i) { return i % 3 == 0; })
.select(function(i) { return i * 10; });
// C# LINQ - lambda
Enumerable.Range(1, 10).Where(i => i % 3 == 0).Select(i => i * 10);
// linq.js - arrow function
Enumerable.range(1, 10).where(i => i % 3 == 0).select(i => i * 10);
// C# LINQ - anonymous type
array.Select((val, i) => new { Value = val, Index = i });
// linq.js - object literal
Enumerable.from(array).select((val, i) => ({ value: val, index: i}));
### Example with Dynamics 365/CRM
Let’s retrieve some data from CRM and query in client side javascript. First of all download and save linq.min.js as a javascript webresource, and save below code as html webresource and change your linq.js webresource name accordingly.
Trying linq.js
Run above HTML web resource in browser & press F12 to see output, it would be similar to below shown output, I have run this code in newly created trial instance of dynamics 365.
> Go through code comments to understand it better.
Hope it helps. Feel free to ask any questons.