Bootstrap 4 Cookbook

How it works…

In step 1, we added an Immediately-Invoked Function Expression (IIFE). This is what every plugin should start with. The only parameter passed into the function declaration is the $, and the argument passed to the function call is jQuery. Doing this solves several problems, such as using the IIFE will make our code self-contained. Passing it the $ as the parameter will ensure that this $ is indeed referring to jQuery and not some other library that might also potentially use the $ and clash with our code. That's why we invoke the IIFE by passing jQuery as its argument.

In step 2, we attach our plugin, called canYouFindIt, onto jQuery.fn (or $.fn for short). This is crucial to make the plugin work. Without going into too much ...