jQuery plugin template

plugin.js

// Protect the '$' alias and add scope by putting everything in
// an Immediately Invoked Function Expression:
// http://stage.learn.jquery.com/javascript-101/functions/#immediately-invoked-function-expression-iife
(function($) {

    // As $.fn is just an alias for $.prototype, all jQuery
    // objects ($ constructor) get our function.
    $.fn.helloWorld = function(options) {
      debug(this);

      // Establish settings by merging the given options with the plugin defaults.
      var settings = $.extend({}, $.fn.helloWorld.defaults, options);

      // Return 'this' so this plugin is chainable.
      return this.each(function() {
        //$(this).text(settings.text);
        $(this).html($.fn.helloWorld.format(settings.text));

        if (settings.color) {
          $(this).css('color', settings.color);
        }

        if (settings.fontStyle) {
          $(this).css('font-style', settings.fontStyle);
        }

        if ($.isFunction(settings.complete)) {
          settings.complete.call(this);
        }
      });

      // Private function for debugging, which is only accessible inside
      // this plugin. This minimizes the plugin footprint/surface/API.
      function debug( obj ) {
        if ( window.console && window.console.log ) {
            window.console.log( "helloWorld selection count: " + obj.length );
        }
      };

    };

    // Provide access to default plugin settings.
    // Usage: $.fn.helloWorld.defaults.text = '¡Hola, mundo!';
    $.fn.helloWorld.defaults = {
      text: 'Hello World!',
      color: null,
      fontStyle: null,
      complete: null
    };

    // Public access to secondary function 'format'. This allows for
    // easy customization of the formatter.
    $.fn.helloWorld.format = function( txt ) {
    return "<strong>" + txt + "</strong>";
};

}(jQuery));

usage.html

<script>
  $(document).ready(function() {
      $.fn.helloWorld.defaults.text = '¡Hola, mundo!';

      $('h1').helloWorld({
        color: '#005dff',
        fontStyle: 'italic'
      });
  });
</script>