kibana/docs/development/plugins/expressions/public/kibana-plugin-plugins-expressions-public.execution.start.md
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[Home](./index.md) &gt; [kibana-plugin-plugins-expressions-public](./kibana-plugin-plugins-expressions-public.md) &gt; [Execution](./kibana-plugin-plugins-expressions-public.execution.md) &gt; [start](./kibana-plugin-plugins-expressions-public.execution.start.md)
## Execution.start() method
Call this method to start execution.
N.B. `input` is initialized to `null` rather than `undefined` for legacy reasons, because in legacy interpreter it was set to `null` by default.
<b>Signature:</b>
```typescript
start(input?: Input, isSubExpression?: boolean): Observable<ExecutionResult<Output | ExpressionValueError>>;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| input | <code>Input</code> | |
| isSubExpression | <code>boolean</code> | |
<b>Returns:</b>
`Observable<ExecutionResult<Output | ExpressionValueError>>`