I've written an API to organize my daily user data. 

The origin format is like

```
"dau": {
      "2017-05-02": 1,
      "2017-05-04": 2,
      "2017-05-05": 2,
      }

"new_user": {
      "2017-05-02": 1,
      "2017-05-04": 0,
      "2017-05-07": 0,
}

```

It's hard to display in HTML table row by row.

Therefore, I want the format to become this one.

However, I have no idea how to deal with.

```
info: {
      "2017-05-02": {
            dau: 1,
            new_user: 1
      },
      "2017-05-04": {
            dau: 2,
            new_user: 0
      },
      "2017-05-05": {
            dau: 2
      },
      "2017-05-07": {
            new_user: 0
      }
}

```