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javascript Module pattern

Want organize your js code in a kind of namespaces, or modules, then use the module pattern. I’ll take the dummy example for getting the current anchor. Let’s look how it would be if the prototype based approach is used:

var Contoso.Utils = function() {};
Contoso.Utils.prototype = {
  getCurrentAnchor: function() {
    var url = window.location;
    var anchor=url.hash; //anchor with the # character
    var anchor2=url.hash.substring(1); //anchor without the # character
    return anchor2;
  }
};
var util = new Contoso.Utils();
var anchor = util.getCurrentAnchor();

The prototype pattern reminds the classic object oriented programming. Now, how would it look in the module pattern:

var Contoso = Contoso || {};
  Contoso.Utils = function() {
  //private
  var invokeCounter = 0;
  var logInvokeCounter = function() {
    invokeCounter++;
    console.log("invoked: " + invokeCounter + " times");
  }
  //public
  return {
    getCurrentAnchor: function() {
      var url = window.location;
      var anchor=url.hash; //anchor with the # character
      var anchor2=url.hash.substring(1); //anchor without the # character
      logInvokeCounter();
      return anchor2;
    }
  }
}();
var anchor = Contoso.Utils.getCurrentAnchor();

It is like a static class in C# and java. It is instantiated only once (which can be a shortcoming sometimes). Pay attention to (); int the end of defition for Contoso.Utils, it ensures the instantiation of the Contoso.Utils.

var Contoso = Contoso || {}; checks if Contoso is not defined yet.

Another way to achieve this is to use ASP.NET Type.registerNamespase.

With Type.registerNamespace you can avoid overriding your classes:

Type.registerNamespace("Contoso");
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