# Subroutines The [gosub ](/3.4.3/data-pipelines/extract/language/gosub.md)function in a data Extractor allows invoking a [subroutine ](/3.4.3/data-pipelines/extract/language/subroutine.md)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. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://olddocs.exivity.io/3.4.3/data-pipelines/extract/subroutines.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.