I'm racking my brain here and need some quick help.

I have the following JSON object:

```
"product": {
    "diagnostics": null,
        "skus": [{
            "itemCode": "Q28988",
            "salesCode": "Q2898800",
            "listPrice": 22,
            "salePrice": 22,
            "numberOfBottles": 1,
            "salePricePerBottle": 22,
            "id": "esku580806",
            "vppApplier": false,
            "vppPrice": null,
            "vppDiscountPct": null
        }, {
            "itemCode": "C28988",
            "salesCode": "C2898800",
            "listPrice": 264,
            "salePrice": 264,
            "numberOfBottles": 12,
            "salePricePerBottle": 22,
            "id": "esku580811",
            "vppApplier": false,
            "vppPrice": null,
            "vppDiscountPct": null
        }],
            "id": "eprod440905",
}

```

And I need to filter the skus array and only return itemCodes that begin with the letter 'Q'. I'm using underscore and JavaScript, and this is the closest I could get, but it doesnt seem to return anything.

```
var codes = _.filter($scope.cb.recommendations, function(obj){
            var startLetter = obj.product.skus.slice(); 
            return startLetter[0] === 'Q';
        });

```

$scope.cb.recommendations is the JSON object - snippet is above. Big thanks!