docs-v2/content/influxdb/cloud/query-data/flux/custom-functions/_index.md

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Create custom Flux functions	Create your own custom Flux functions to transform and operate on data.	Custom functions	functions custom flux	influxdb_cloud name parent Custom functions Query with Flux	220	```js multByX = (tables=<-, x) => tables |> map(fn: (r) => ({r with _value: r._value * x})) data |> multByX(x: 2.0) ```

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