# API Reference


## Functions


Utility functions


[count_up()](count_up.md#gdtest_generators.count_up)  
Count upward from a start value.

[fibonacci()](fibonacci.md#gdtest_generators.fibonacci)  
Generate Fibonacci numbers up to a limit.

[iter_chunks()](iter_chunks.md#gdtest_generators.iter_chunks)  
Iterate over data in chunks.