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# parameterID(at:)

Returns the ID of the parameter at the given index.

```
func parameterID(at index: UInt32) -> UInt32
```

## Parameters

`index`

The 0-based index of the parameter whose ID you wish to get.

## Discussion

During `-addParameters:` your plugin tells the host to create parameters. Later, while running, your plugin can create new parameters using the FxParameterCreationAPI (just like in `-addParameters`), or it can remove them using the `-removeParameter:` method of this protocol. Each parameter must have a unique ID within the plugin. This method allows you to retrieve the ID of a parameter at a given index in the list of parameters. The IDs need not be sequential or even increasing. You could for example have the following:

|Index|ID    |Parameter   |
|-----|------|------------|
|`0`  |`1`   |`slider`    |
|`1`  |`1000`|`checkbox`  |
|`2`  |`10`  |`popup menu`|

---

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