Lodash is a popular javascript based library which provides 200+ functions to facilitate web development. It provides helper functions like map, filter, invoke as well as function binding, javascript templating, deep equality checks, creating indexes and so on. Lodash can be used directly inside a browser and also with Node.js. Working with objects using JavaScript can be quite challenging, specifically if you have lots of manipulation to be done with them. Underscore comes with lots of features that eases your work with objects.