> For the complete documentation index, see [llms.txt](https://astro-rpa.gitbook.io/astro-rpa-user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://astro-rpa.gitbook.io/astro-rpa-user-guide/astro-studio/variables.md).

# Variables and arguments

There are variables in the work of the scripts for storing intermediate data. There is the Variable panel for managing variables.

![](/files/EvAG5YBMRPZxa19sIXzv)

A variable consists of the following parts:

* Variable name is set according to rules of selected language (C#, Python или JavaScript)
* Variable type is a variable data type in selected language
* Comment is a text describing the purpose of a variable (optional)
* Default value is an expression in selected language executed when creating a variable, the result of which will be assigned to the variable at creation (optional)

If you do not specify the default value for a variable, the initial value of the variable will be NULL.

To create a new variable, press the "Create a Variable" button ![](/files/h2sKzZTn2cMzyXmc6tql) and enter information about the variable in the window that appears.

![](/files/3cOZBcAp9VpwpuYvQ0Vu)

For a more convenient selection of a variable type, you can press the "..." button and find the desired one in the Data Types window.

![](/files/dqVEfDC1pXPNE0lRGZl5)

There is a generalized type selection assistant necessary for working with generalized types in the Data Type window.

![](/files/pYRdBhVp1W3adeoutdOv)

To delete a variable, you should select a line with it in the table and either click the "Delete the Variable" button ![](/files/X1mgyl7u2Lt8lQGhUJvJ), or press the Delete button.

To edit a variable, double-click on the line, the value of which should be changed.

The type of a variable is an autocomplete value, for example, just type List \<String> and press Enter, and the system itself will bring the type to System. Collections.Generic.List\<System.String>.

Arguments are variables intended for exchange between processes. The difference from a normal variable is the presence of the Direction property, which determines whether an argument can receive and transmit data to the calling process. The property Direction has the following values:

IN – The argument works only for receipt

OUT – The argument works only for transmission

IN\_OUT – Both-way argument

![](/files/tWDv8PozEPaBih53uePh)

To call a process from another process, you need to drag the called process from the Project panel to the triangle that defines the place of the subprocess call in the script.

![](/files/IzqkTkdR5fkgWY2pscLU)

To connect to the arguments of the subprocess, you should press ![](/files/oeTWK4zZYv7rIxecnQbg) button. In the Assignment column of the opened window you should specify expressions in selected language (C#, Python or JavaScript) or the names of the variables used in the interaction with the subprocess. Once you have finished editing, you can close the window.

![](/files/RAL24ZnsNxRD3Us1IAep)