code: function (path1, path2) {
      return path1.length === 0 ? path2 :
        (path2.length === 0 ? path1 : path1.concat(path2));
    }
docs: Join two array paths.
  @param {Array} path1 array of string and numbers
  @param {Array} path2 array of string and numbers
  @returns {Array} joined path
  @memberOf Util