hayadentaku

https://github.com/barmidrol/dentaku

Hayadentaku ("haya" 速 = fast + "dentaku" 電卓 = calculator) is a speed-focused, drop-in compatible fork of Dentaku, a parser and evaluator for mathematical and logical formulas with run-time variable binding. The Ruby module name remains `Dentaku`, so you can swap the gem in your Gemfile without code changes.