prototype - Why doesn't my JavaScript constructor pattern work? -

why doesn't javascript pattern work? example try call function this.prepare.build(), doesn't works. gives me error:

this.prepare.build not function

<script> $(function () {     new $.myfunction(); }); </script>   <script> (function($) {      'use strict';     function myfunction(options) {         return new myfunction.prototype.init(options);     }      myfunction.fn = $.myfunction.prototype = {         init: function() {             console.log('call: myfunction.init')             this.prepare.build();         },         prepare: function() {             return {                  build: function() {                         console.log('call: myfunction.prepare.build');                  },                  run: function() {                         console.log('call: myfunction.prepare.run');                  }             }         }     }     inviter.prototype.init.prototype = inviter.prototype; })(jquery); </script> 

might answer question. prepare function build, need call both:

this.prepare().build()