UnderscoreJS

I will introduce you to one more JavaScript framework that can be helpful in development. UnderscoreJS (http://underscorejs.org/) is a framework that brings functional programming constructs and techniques to the language. The library contains over 100 methods that add functional support to JavaScript.

UnderscoreJS is a single JavaScript file downloaded just like jQuery and RequireJS. If you add the requisite versioned underscore.js file to the /js/lib folder, then you already have the means to inject it into your application. Here is the additional configuration in the file, require-setup.js:

var require = {
  shim: {
    "bootstrap" : { "deps" :['jquery'] },
    "jquery": { exports: '$' },
    "underscore": { exports: '_'}
  },
  paths: {
    "jquery" : "jquery-2.1.3",
    "bootstrap" : "bootstrap-3.2.0",  
    "underscore" : "underscore-1.8.2"
  }
};

UnderscoreJS exports the symbol underscore (_) for its library to a developer and its function methods are accessible through...