> For the complete documentation index, see [llms.txt](https://docs.ifreeq.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ifreeq.com/developer/configure-in-platform/function-definition.md).

# Function Definition

- [Overview](https://docs.ifreeq.com/developer/configure-in-platform/function-definition/overview.md)
- [Standard Functions](https://docs.ifreeq.com/developer/configure-in-platform/function-definition/standard-functions.md)
- [Custom Functions](https://docs.ifreeq.com/developer/configure-in-platform/function-definition/untitled-2.md)
- [Cloud Functions](https://docs.ifreeq.com/developer/configure-in-platform/function-definition/untitled-3.md)