The Drupal 8 development cycle has definitely been a long one. There are several exciting features on the way, but the improvements to the authoring experience in Drupal 8 have definitely drawn a lot of attention. (I know Amber is clamoring for in-place editing for this blog.) The Spark project is the home to much of this work. Several new core modules that contribute to these improvements (Contextual, Quickedit, Toolbar, CKEditor and to a lesser extent, Tour) leverage a pair of popular javascript libraries Backbone.js and Underscore.js.

Both Backbone.js, and its dependency Underscore.js were committed to Drupal 8 two years ago! Let's take a quick look at both Backbone.js and Underscore.js, how they're used in core, and how you might be able to use them to simplify some javascript for your site.