# CustomData

## Importing the class

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.
```zenscript
import crafttweaker.api.item.component.CustomData;
```


## Static Methods

:::group{name=of}

Return Type: [CustomData](/vanilla/api/item/component/CustomData)

```zenscript
CustomData.of(tag as MapData) as CustomData
```

| Parameter |                 Type                 |
|-----------|--------------------------------------|
| tag       | [MapData](/vanilla/api/data/MapData) |


:::

## Methods

:::group{name=contains}

Return Type: boolean

```zenscript
CustomData.contains(key as string) as boolean
```

| Parameter |  Type  |
|-----------|--------|
| key       | string |


:::

:::group{name=matchedBy}

Return Type: boolean

```zenscript
CustomData.matchedBy(tag as MapData) as boolean
```

| Parameter |                 Type                 |
|-----------|--------------------------------------|
| tag       | [MapData](/vanilla/api/data/MapData) |


:::

:::group{name=update}

Return Type: [CustomData](/vanilla/api/item/component/CustomData)

```zenscript
CustomData.update(updater as Consumer<MapData>) as CustomData
```

| Parameter |                         Type                         |
|-----------|------------------------------------------------------|
| updater   | Consumer&lt;[MapData](/vanilla/api/data/MapData)&gt; |


:::


## Properties

|  Name   |    Type     | Has Getter | Has Setter |
|---------|-------------|------------|------------|
| copyTag | **invalid** | true       | false      |
| isEmpty | boolean     | true       | false      |
| size    | int         | true       | false      |



Name	Type	Has Getter	Has Setter
Name copyTag	Type invalid	Has Getter true	Has Setter false
Name isEmpty	Type boolean	Has Getter true	Has Setter false
Name size	Type int	Has Getter true	Has Setter false