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RailsConf 2019 -  From test && commit || revert to LIMBO by Shane Becker

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Kent Beck (TDD, eXtreme Programming, Agile Manifesto) has a couple new ideas. They both sound so terrible and impossible that they just might be totally amazing.

1. test && commit || revert If tests pass, commit everything. If they fail, revert everything. Automatically. Wild.

2. LIMBO. Anything that's committed is pushed. Anything that's committed by teammates is automatically pulled in while you work. So wild.

Does this work? Does it scale? Will I always be losing important progress because of a typo? Will this make me a better / faster / happier programmer?

We'll cover tools, process, deficiencies, mental models, and experiences. Show up and see what happens.

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In this talk from RailsConf 2019, Shane Becker discusses the concept of "Test && Commit || Revert" (TCR), exploring its origins, practical applications, and implications for software development. The talk is structured in three parts, starting with a technical overview of TCR, followed by a historical context that highlights the evolution of programming patterns and methodologies that led to TCR, and concluding with practical insights from Becker's own experiences implementing the concept.

### Key Points Discussed:
- **Understanding TCR**: TCR is a process where if tests pass, all changes are committed; if they fail, all changes are reverted. This mechanism emphasizes rapid feedback and encourages programmers to work in small increments.
- **Historical Context**: Becker shares a brief history of influential concepts and figures in software development, such as Kent Beck, who contributed to Test-Driven Development (TDD) and the Agile Manifesto. The principles of TCR can be traced back to architectural patterns discussed in books like "A Pattern Language".
- **The Evolution of Programming**: The talk reflects on how the TCR methodology is grounded in past programming practices and philosophies, asserting that many modern practices are derived from earlier ideas.
- **Implementation and Lessons Learned**: Becker recounts practical experiences using TCR, identifying challenges such as reverts during coding sessions, which led to valuable lessons. Important takeaways include the significance of fast tests, the benefit of making small, incremental changes, and trusting the automation process.
- **Practical Application**: He encourages attendees to implement TCR in real-world projects, emphasizing experimentation with TCR while remaining in a safe coding environment. Becker offers suggestions for improving tool integration and enhancing TCR practices.

### Conclusions and Takeaways:
- Becker asserts that TCR can potentially reshape the way programmers approach software development. It fosters a culture of safety in experimenting with code, while boosting efficiency and reducing the fear of failure in committing code changes. 
- The talk concludes with a call to action for developers to explore TCR, whether in toy projects or live applications, and to engage with the broader programming community about their experiences with this approach.

Overall, Shane Becker's presentation at RailsConf 2019 sheds light on an innovative approach to coding practices that combines history, theory, and practical application in a rapidly evolving field.

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