> For the complete documentation index, see [llms.txt](https://doc.sysdevmobile.com/kalipso/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.sysdevmobile.com/kalipso/documentation/expressions/functions.md).

# Functions

Functions are "self contained" modules of code that accomplish a specific task. Functions usually "take in" data, the input parameters, process it, and "return" a result.

All functions in Kalipso are available for the following operating systems:

<figure><img src="https://1614058754-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FJ5vDGuBZwhJDeu5Rq7Wt%2Fuploads%2Fgit-blob-7a7ab3f3fc74afcaab1e0810f419316203cc49e1%2F01_Supported_OS.png?alt=media" alt="OS Supported: Android, iOS, Win, Win32"><figcaption></figcaption></figure>

In this group of pages you can access the list of functions and their description:

* [String Functions](/kalipso/documentation/expressions/functions/string-functions.md)
* [Numeric Functions](/kalipso/documentation/expressions/functions/numeric-functions.md)
* [Conditional Functions](/kalipso/documentation/expressions/functions/conditional-functions.md)
* [Date Functions](/kalipso/documentation/expressions/functions/date-functions.md)
* [Time Functions](/kalipso/documentation/expressions/functions/time-functions.md)
* [Conversion Functions](/kalipso/documentation/expressions/functions/conversion-functions.md)
* [Operators](/kalipso/documentation/expressions/functions/operators.md)
* [Keywords](/kalipso/documentation/expressions/functions/keywords.md)
* [Others](/kalipso/documentation/expressions/functions/others.md)