latest.js

var getElementsByClassName = function(className, element) {
  //creating resultArr to be returned
  var resultArr = [];
  var element = element || document.body;
  var targetNodes = element.childNodes;
  if (element.classList) {
  	if (element.classList.contains(className)) {
    	resultArr.push(element);
  	}
	if (children.length > 0) {
	    for(var i = 0; i < targetNodes.length; i++) {
	      resultArr = resultArr.concat(getElementsByClassName(className, targetNodes[i]));
    	}
	}
  	return resultArr;
};