element creator with emmet-like string

gistfile1.js

function(selector){
  var arr = selector.replace(/([.#])/g,",$&").split(',');
  var classes = arr.filter(function(e){return e.substr(0,1) == '.'}).map(function(e){return e.slice(1)});
  var id = arr.filter(function(e){return e.substr(0,1) == '#'})[0];
  var elementName = 'div';
  if(!(arr[0] == '' || arr[0].substr(0,1).match(/[.#]/))) elementName = arr[0];
  
  var newElement = document.createElement(elementName);
  if(classes.length>0) newElement.className = classes.join(' ');
  if(id) newElement.id = id.slice(1);
 
  return newElement;
}