base.js

//place inside an anonymous function
(function ($) {
  // on document ready code
  $(function(){
    $.namespace.functionName();
    $.namespace2.anotherFunctionName();
  });
}(jQuery));

namespace1.js

/* a small pattern to make jQuery functionality maintainable and readable*/

//place inside an anonymous function
(function ($) {
  //request namespace or make a new object
  $.namespace = $.namespace || {};

  //add (new) functions to your namespace
  $.extend($.namespace, {
    functionName: function() {
      //your code...
    },
    anotherFunctionName: function() {
      //your code...
    },
  });
}(jQuery));

namespace2.js

//place inside an anonymous function
(function ($) {
  //request namespace or make a new object
  $.namespace2 = $.namespace2 || {};

  //add (new) functions to your namespace
  $.extend($.namespace2, {
    functionName: function() {
      //your code...
    },
    anotherFunctionName: function() {
      //your code...
    },
  });
}(jQuery));