var obj = {
  'id': '1', 'name': 'renyang', 'birth': 1985, 'role': 'manager',
  'member': [
    {
      'id': '2', 'name': 'huangfan', 'birth': 1983, 'role': 'manager',
      'member': [
        {'id': '3', 'name': 'chenxiong', 'birth': 1984, 'role': 'engineer'}
      ]
    },
    {
      'id': '4', 'name': 'yuguang', 'birth': 1981, 'role': 'engineer manager',
      'member': [
        {'id': '5', 'name': 'chenjian', 'birth': 1985, 'role': 'engineer'}
      ]
    },
    {
      'id': '6', 'name': 'deshi', 'birth': 1980, 'role': 'engineer manager',
      'member': [
        {'id': '7', 'name': 'haibo', 'birth': 1983, 'role': 'engineer'},
        {'id': '8', 'name': 'weitao', 'birth': 1987, 'role': 'engineer'},
        {'id': '9', 'name': 'liuzheng', 'birth': 1986, 'role': 'engineer'},
        {'id': '10', 'name': 'xiaoxue', 'birth': 1988, 'role': 'engineer'},
        {'id': '11', 'name': 'xuebin', 'birth': 1982, 'role': 'engineer',
          'member': [
            {'id': '12', 'name': 'sam', 'birth': 1980, 'role': 'engineer'},
            {'id': '13', 'name': 'loklaan', 'birth': 1990, 'role': 'engineer'}
          ]
        }
      ]
    }
  ]
};

// the first param is the name of 'Id' property of JSON object and the second one
// is 'children' property name
var jsonloop = new JSONLoop(obj, 'id', 'member');

// node is what we are looking for
jsonloop.findNodeById(obj, '11', function(err, node) {
  if (err) {
    console.log(err);
  } else {
    console.dir(node);
  }
});

// find our uE engineer with her name
jsonloop.findNodes(obj, {'name': 'xiaoxue'}, function(err, nodes) {
  nodes.forEach(function(node) {
    console.dir(node);
  });
});
// find young engineers in our team. Here, nodes is an array of node.
jsonloop.findNodes(obj, {'role': /engineer/i, 'birth': {'>=': 1985, '<': 1990}},
  function(err, nodes) {
    nodes.forEach(function(node) {
      console.dir(node);
    });
});

jsonloop.findNodeById(obj, '11', function(err, node) {
  if (err) {
    console.log(err);
  } else {
    console.clear();
    jsonloop.findParent(obj, node, function(err, node) {
      console.clear();
      if (err) {
        console.log(err);
      } else {
        console.dir(node);
      }          
    });
  }
});

jsonloop.findNodeById(obj, '11', function(err, node) {
  if (err) {
    console.log(err);
  } else {
    console.clear();
    jsonloop.findSiblings(obj, node, function(err, siblings) {
      console.clear();
      if (err) {
        console.log(err);
      } else {
        siblings.forEach(function(item) {
          console.dir(item);
        });
      }          
    });
  }
});

jsonloop.findNodeById(obj, '12', function(err, node) {
  console.clear();
  if (err) {
    console.log(err);
  } else {
    jsonloop.findAncestors(obj, node, function(err, ancestors) {
      console.clear();
      if (err) {
        console.log(err);
      } else {
        ancestors.forEach(function(item) {
          console.dir(item);
        });
      }          
    });
  }
});