> For the complete documentation index, see [llms.txt](https://docs.rulecube.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rulecube.com/v2.5/language-reference.md).

# Language Reference

To discover all the built-in functions that Rulecube offers, the best way is to click on the ![](/files/A38mSqTGAD1JPrMB1MdV) icon and then on "Documentation" in Rulecube itself. This will open the Rulecube Manual.

There are several different namespaces the Rulecube language domain is divided into:

* [Global](/v2.5/language-reference/global.md): general methods with uppercase names, available without prepending a namespace. 
* [Array](/v2.5/language-reference/array.md): extension methods to JavaScript's Array object. 
* [Compression](/v2.5/language-reference/compression.md): a collection of compression functions.
* [Crypto](/v2.5/language-reference/crypto.md): a collection of cryptographic functions.
* [Date](/v2.5/language-reference/date.md): extension methods to JavaScript's Date object.
* [DocAI](/v2.5/language-reference/docai.md): automate document processing and extraction using AI. 
* [Encryption](/v2.5/language-reference/encryption-deprecated.md): a collection of encryption functions.
* [Finance](/v2.5/language-reference/finance.md): a collection of financial functions.
* [Http](/v2.5/language-reference/http.md): a collection of functions to make calls to APIs and websites.
* [Mail](/v2.5/language-reference/mail.md): a collection of e-mail functions.
* [MongoDB](/v2.5/language-reference/mongodb.md): a collection of MongoDB functions, like "find" and "aggregate".
* [Ockto](/v2.5/language-reference/ockto.md): a collection of Ockto functions, to get personal data from validated external sources. 
* [PDF](/v2.5/language-reference/pdf.md): a collection of PDF functions, using an external component Html2PDF.
* [SQL](/v2.5/language-reference/sql.md): a collection of SQL functions, like "execute" and "executeStoredProcedure".
* [Statistics](/v2.5/language-reference/statistics.md): a collection of statistical functions, like "mean", "median", and "slope".
* [System](/v2.5/language-reference/system.md): system actions. For advanced users only.
* [UserStore](/v2.5/language-reference/userstore.md): a collection of Rulecube User-related functions.
* [Workflow](/v2.5/language-reference/workflow.md): workflow helper library to support easy workflow definitions.


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