# BT.features

## Function

 returns the current interpreter capability table.

## Syntax

```bt
BT.features()
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| None | - | No | None | No parameters required. |

## Return Value

| Type | Description |
| ------ | ------ |
| Object | Returns the interpreter capability object. See "Return Object Fields" below for fields. |

## Return object field

| Field | Type | Must exist | Description |
| ------ | ------ | ------ | ------ |
| web | Bool | Yes | Whether to have built-in Web service capabilities. The current standard build is `true`. |
| desktop | Bool | Yes | Whether to enable desktop App capabilities. The CLI build is usually `false` and the bt_app desktop build is `true`. |
| ffi | Bool | Yes | Whether to build in the native dynamic library FFI. The official BT interpreter is `true`. |
| net | Bool | Yes | Whether to build in TCP, UDP, WebSocket, DNS and network interface related capabilities. |
| device | Bool | Yes | Whether to have built-in device communication capabilities. Currently contains serial serial port capabilities. |
| mysql | Bool | Yes | Whether the MySQL standard library is built-in. |
| reqwest | Bool | Yes | Whether to build in the HTTP client standard library. |
| crypto | Bool | Yes | Whether to have built-in encryption digest capabilities such as SHA, HMAC, and UUID. |
| fs | Bool | Yes | Whether to build the file system standard library. |
| process | Bool | Yes | Whether to build in child process and process environment related capabilities. |
| stats | Bool | Yes | Whether to build in `BT.stats()` runtime statistics capability. |
| bytes | Bool | Yes | Whether to build Bytes binary byte capability. |
| modbus | Bool | Yes | Whether to have built-in Modbus frame building, parsing and CRC auxiliary capabilities. |

## Examples

```bt
features = BT.features()
result = features.process

// Output: true
print result
```

## Notes

- desktop will reflect whether the current binary actually enables desktop capabilities.
- ffi will reflect whether the current interpreter has built-in FFI; BT official interpreter has built-in FFI by default, and the special tailored version may be `false`.
- features returns the static capability table and does not perform runtime scanning.
-Field names are fixed with snake_case or lowercase words, and can be used with `BT.has(name)` to determine individual abilities.