> For the complete documentation index, see [llms.txt](https://docs.opencutlist.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.opencutlist.org/features/parts/formulas.md).

# Formulas

## The power of Ruby

When a formula field is available, OpenCutList gives you access to a list of variables where you can play with their data by writing [Ruby](https://www.ruby-lang.org/fr/documentation/) code.

Each variable as a [Data Type](/features/parts/formulas/data-types.md) that allows you to access some properties and functions.

## Formula field

The formula field is a text form field where you can write Ruby code. To display the list of available first  level variables, type the **@** character. The list of variables may differ from form to form.

<figure><img src="/files/QchppdUAoMsxELIQTMpp" alt=""><figcaption></figcaption></figure>

With formulas you can perform various things, from concatenate or decorate texts (string) ...

<figure><img src="/files/TJ0riEtFtbmp26xRL5zs" alt=""><figcaption></figcaption></figure>

... to more complex operations with conditional structures.

<figure><img src="/files/L5YqiUig7mjkZcivwSik" alt=""><figcaption></figcaption></figure>