Github user felizbear commented on the pull request:

    https://github.com/apache/incubator-zeppelin/pull/796#issuecomment-208119840
  
    @johnnyws looks good. a few minor comments
    
    + creating en empty object and assigning props to it is unconventional in 
JS; normally, you would create an object together with the props:
    
    ```
    // instead of 
     var notes = {};
     notes.root = {
        children : []
     };
     notes.flatList = [];
    
    // better do
    var notes = {
      root: {children: []},
      flatList: [],
      setNotes: function() {}
    }
    ```
    
    + I'd move `addNode` declaration outside of `setNotes` to prevent it from 
being recreated on each step of `reduce`.


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