js function examples about namespace_javascript skills

var MYAPP = MYAPP || {};
MYAPP.namespace = function(ns_string){
    var parts = ns_string.split('.');
    var parent = MYAPP;
    var i=0;
    if(parts[0]==="MYAPP"){
      parts = parts.slice(1);
    }
    for(i=0 ; i<parts.length; i++){
      if(typeof parent[parts[i]]=='undefined'){
        parent[parts[i]]={};
      }
      parent = parent[parts[i]];
    }
    return parent;
}
var module2= MYAPP.namespace('MYAPP.modules.module2');