# Feed 'A' - Assets

**Requests**

{% tabs %}
{% tab title="Subscribe" %}

```json
{"event": "bind", "feed": "A"}
```

{% endtab %}

{% tab title="Unsubscribe" %}

```json
{"event": "unbind", "feed": "A"}
```

{% endtab %}
{% endtabs %}

**Feed handling**

{% tabs %}
{% tab title="Definitions" %}

```json
asset = {
  "name": string,
  "id": unsigned int32,
  "price": Efx::Price // USD price of the asset
}
```

{% endtab %}

{% tab title="Possible updates" %}

```json
// snapshot
['A', 0, 'S', [array of assets]]

// assets added
['A', 0, '+', [array of assets]]

// asset price modified
['A', 0, 'M', [array of assets]]

// assets removed
['A', 0, '-', [array of assets]]

// failed to subscribe
['A', 0, 'Z', 2]

// unsubscribed
['A', 0, 'U', 0]
```

{% endtab %}

{% tab title="Feed update example" %}

```javascript
applyToSnapshot(prevSnapshot, feed, action, data) {
    switch (feed) {
        case 'A': {
            switch (action) {
                case 'S' : {
                    return data
                }
                case '+' : {
                    for (var asset in data) {
                        prevSnapshot[asset[0]] = asset
                    }
                    break
                }
                case 'M' : {
                    for (var asset in data) {
                        prevSnapshot[asset[0]] = asset
                    }
                    break
                }
                case '-' : {
                    for (var asset in data) {
                        prevSnapshot.delete(asset[0])
                    }
                    break
                }
            }
            break
        }   
    }
    return prevSnapshot
}
```

{% endtab %}
{% endtabs %}


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