walk a graph and generate an array of objects

gistfile1.txt

      function walk(obj) {

        function root(key) {
          return {key: key, text: key};
        }
        function node(parent, key, leaf) {
          key = typeof key == 'number' ? String(key) : key;
          parent = typeof parent == 'number' ? String(parent) : parent;
          return {key: key, text: key, parent: parent, leaf: leaf};
        }
        function iter(parent, obj, accum) {
          if (typeof obj == 'string') {
            accum.push(node(parent, obj, true));
          }
          if (typeof obj == 'object') {
            _.each(obj, function (val, key) {
              accum.push(node(parent, key, false));
              var children = iter(key, val, []);
              accum = accum.concat(children);
            });
          }
          return accum;
        }

        return iter('root', obj, [root('root')]);
      }