The cel-examples repository has a directory of fully functional examples as well as a directory of FAQs. The goal of these resources is to help developers working with the Elastic mito extension of CEL understand the language better and to be more productive.
Common Expression Language (CEL) is non-Turing complete functional language. Elastic chose CEL due to its performance and safety. Rather than using a sandbox to run the program, CEL can be embedded as a library. Elastic extended CEL in the mito project to include support for requesting and processing API requests.
As a non-turing complete functional language, the structure of CEL programs can seem foreign to procedural or object-oriented programmers. For more information on CEL and mito extensions, see the official documentation: Google CEL, mito CEL extension.
The examples directory has functioning CEL programs. Each example has a docker-compose file to run a mock server to serve an API so the example can be run in realistically. The README.md explains how to run the examples.
There are several files in the FAQs directory with how-tos on how to write CEL code, structure CEL programs for handling API request errors, how to fix compile errors and set up an editor for CEL. Many code examples for the mito extensions exist in the mito repository testdata directory mito testdata. The FAQ code snippets are complementary to the code examples in the mito repository. The code examples in the FAQs are focused on use in processing API requests.