I'm having data like: 

```
    { mealName: "sandwich", price: 0 },
    { mealName: "lobster", price: 34.95 },
    { mealName: "whole zebra", price: 290 },
    { mealName: "whole zebra", price: 290 },
    { mealName: "sandwich", price: 290 },
    { mealName: "whole zebra", price: 290 }

```

And I want to get observableArray like:

```
{ mealName: "sandwich"},
{ mealName: "whole zebra"},
{ mealName: "lobster"}

```

I've tried to reproduce it in [jsFiddle](http://jsfiddle.net/zmnkygyd/3/), but something is wrong