kibana/docs/development/plugins/expressions/public/kibana-plugin-plugins-expressions-public.expressionfunctiondefinition.fn.md
2020-09-30 09:10:28 +02:00

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[Home](./index.md) &gt; [kibana-plugin-plugins-expressions-public](./kibana-plugin-plugins-expressions-public.md) &gt; [ExpressionFunctionDefinition](./kibana-plugin-plugins-expressions-public.expressionfunctiondefinition.md) &gt; [fn](./kibana-plugin-plugins-expressions-public.expressionfunctiondefinition.fn.md)
## ExpressionFunctionDefinition.fn() method
The actual implementation of the function.
<b>Signature:</b>
```typescript
fn(input: Input, args: Arguments, context: Context): Output;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| input | <code>Input</code> | |
| args | <code>Arguments</code> | |
| context | <code>Context</code> | |
<b>Returns:</b>
`Output`