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13 lines
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13 lines
887 B
Markdown
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
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[Home](./index.md) > [kibana-plugin-plugins-expressions-server](./kibana-plugin-plugins-expressions-server.md) > [ExpressionAstFunctionBuilder](./kibana-plugin-plugins-expressions-server.expressionastfunctionbuilder.md) > [getArgument](./kibana-plugin-plugins-expressions-server.expressionastfunctionbuilder.getargument.md)
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## ExpressionAstFunctionBuilder.getArgument property
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Retrieves an existing argument by name. Useful when you want to retrieve the current array of args and add something to it before calling `replaceArgument`<!-- -->. Any subexpression arguments will be returned as expression builder instances.
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<b>Signature:</b>
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```typescript
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getArgument: <A extends FunctionArgName<FnDef>>(name: A) => Array<FunctionArgs<FnDef>[A] | ExpressionAstExpressionBuilder> | undefined;
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```
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