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

title	description	list_title	influxdb/v2/tags	menu	weight	aliases	list_code_example	source
Create custom Flux functions	Create your own custom Flux functions to transform and operate on data.	Custom functions	functions custom flux	influxdb_v2 name parent Custom functions Query with Flux	220	/influxdb/v2/query-data/guides/custom-functions/	```js multByX = (tables=<-, x) => tables |> map(fn: (r) => ({r with _value: r._value * x})) data |> multByX(x: 2.0) ```	/shared/influxdb-v2/query-data/flux/custom-functions/_index.md