answer to recursive thing

gistfile1.txt

var traverseDomAndCollectElements = function(matchFunc, startEl) {
  
  var resultSet = [];
  
  if (typeof startEl === "undefined") {
    startEl = document.body;

  }

if(matchFunc(startEl)) {
    resultSet.push(startEl);
}

    for(var i=0;i<startEl.children.length;i++){
            traverseDomAndCollectElements(matchFunc,startEl.children[i]);

  
    resultSet = resultSet.concat(traverseDomAndCollectElements(matchFunc,startEl.children[i]));

    };
  return resultSet;
};