“Official” way to author a jQuery Plugin, and maintain chainability

(function( $ ){

  var methods = {
    init : function( options ) { // THIS },
    show : function( ) { // IS   },
    hide : function( ) { // GOOD },
    update : function( content ) { // !!! }
  };

  $.fn.tooltip = function( method ) {

    // Method calling logic
    if ( methods[method] ) {
      return methods[ method ].apply( this, Array.prototype.slice.call( arguments, 1 ));
    } else if ( typeof method === 'object' || ! method ) {
      return methods.init.apply( this, arguments );
    } else {
      $.error( 'Method ' +  method + ' does not exist on jQuery.tooltip' );
    }    

  };

})( jQuery );

// USAGE...

$('div').tooltip(); // calls the init method
$('div').tooltip({  // calls the init method
  foo : 'bar'
});
$('div').tooltip('hide'); // calls the hide method
$('div').tooltip('update', 'This is the new tooltip content!'); // calls the update method

// EXAMPLE WITH DEFAULTS / OPTIONS

(function( $ ){

  $.fn.tooltip = function( options ) {  

    var settings = {
      'location'         : 'top',
      'background-color' : 'blue'
    };

    return this.each(function() {        
      // If options exist, lets merge them
      // with our default settings
      if ( options ) { 
        $.extend( settings, options );
      }

      // Tooltip plugin code here

    });

  };
})( jQuery );

// USAGE

$('div').tooltip({
  'location' : 'left'
});

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