This talk was given at RubyConf 2020. Video coming soon…

Here are the slides:

Talk Description:

Hashes seem simple. Set a key to a corresponding value, retrieve the value by key. What else is there to know?

A whole lot, it turns out! Ruby makes several surprising choices about how hashes work, which turn hashes into dynamic powerhouses of functionality.

We’ll dive into how hashes work, understand how they form the groundwork for some extremely useful standard library utilities, and learn patterns to leverage the unparalleled versatility of the humble hash to write concise, performant, beautiful code.