find multi dimension dataLayer value

DataLayer_find.js

var nodeExplorer = function (node, key, val, count) {
    var k,
        r,
        j,
        checkCount = count || 0;
    if (!!node && node[key] !== undefined) {
      if(!!val && node[key] === val){
        return node;
      }
      if(!val){
        return node;
      }
    }
    if (node instanceof Array && checkCount < 5) {
      for (k = node.length - 1; k >= 0; k -= 1) { 
        r = nodeExplorer(node[k], key, val, checkCount+1);
        if (r !== undefined) {
          return r;
        }
      }
    } else if (typeof node === "object" && checkCount < 5) {
      for (j in node) {
        if (node.hasOwnProperty(j)) {
          r = nodeExplorer(node[j], key, val, checkCount+1);
          if (r !== undefined) {
            return r;
          }
        }
      }
    }
  };

  var getDataLayerValue = function(key) {
    var res = nodeExplorer(window.dataLayer, key);
    return res ? res[key] : undefined;
  };

  var getDataLayerObject = function(key, val){
    var res = nodeExplorer(window.dataLayer, key, val);
    return !!res ? res : false;
  };
  
  var getDataLayerListById = function(key) {
    var _nodeExplorer = function(node, key, ret, count) {
      var k,
          j,
          checkCount = count || 0;
      if (!!node && node[key] !== undefined) {
        if (node[key]) {
          ret.push(node);
        }
      }
      if (node instanceof Array && checkCount < 5) {
        for (k = node.length - 1; k >= 0; k -= 1) {
          r = _nodeExplorer(node[k], key, ret, checkCount+1);         
        }
      } else if (typeof node === "object" && checkCount < 5) {
        for (j in node) {
          if (node.hasOwnProperty(j)) {
            r = _nodeExplorer(node[j], key, ret, checkCount+1);
          }
        }
      }
      return ret;
    };
    return _nodeExplorer(this.dataLayer, key, []);
  };
  
  function getDatalayerList(key){
    var dl = getDataLayerListById(key)
	var ls = [];
	var list = dl.map( function(t){ 
	//debugger
	if(!!t[key]){
	   ls.push(t[key])
	   }
	})
	return ls
  }