kibana/docs/development/plugins/expressions/public/kibana-plugin-plugins-expressions-public.expressionsservicestart.getfunction.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; [ExpressionsServiceStart](./kibana-plugin-plugins-expressions-public.expressionsservicestart.md) &gt; [getFunction](./kibana-plugin-plugins-expressions-public.expressionsservicestart.getfunction.md)
## ExpressionsServiceStart.getFunction property
Get a registered `ExpressionFunction` by its name, which was registered using the `registerFunction` method. The returned `ExpressionFunction` instance is an internal representation of the function in Expressions service - do not mutate that object.
<b>Signature:</b>
```typescript
getFunction: (name: string) => ReturnType<Executor['getFunction']>;
```