# Subroutines

The [gosub ](https://olddocs.exivity.io/3.4.3/data-pipelines/extract/language/gosub)function in a data Extractor allows invoking a [subroutine ](https://olddocs.exivity.io/3.4.3/data-pipelines/extract/language/subroutine)in a data extractor script. Subroutines are useful to avoid having to duplicate code snippets. 

Our customers and Solution Architects have created several useful subroutines over the last few years. We are keeping a small library of the most useful ones on our public docs. You can find them listed on this page.