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### Summary of 'Make Ruby Functional Again!'

In the presentation titled "Make Ruby Functional Again!" given by Devon Estes at Ruby Day 2016, the main theme revolves around the evolution of Ruby in the context of multi-core processing and the necessity to embrace functional programming concepts to maintain its relevance as a programming language. Estes introduces several critical challenges Ruby programmers face due to shifting processing technologies and user expectations.

#### Key Points Discussed:

- **Introduction to Ruby's Challenges**: 
  - Discussion on Moore's Law and how its decline affects application performance and complexity. 
  - Highlights the shift from faster clock speeds to multi-core processing.

- **Functional Programming as a Solution**:
  - Ruby programmers are encouraged to explore functional programming features to optimize code for multi-core systems.
  - Key functional programming concepts mentioned include:
    - **Immutable Data Structures**: Use of the `freeze` method for immutability.
    - **Lazy Evaluation**: Introduced through methods like `lazy` in `Enumerator`, enhancing performance.
    - **Pure Functions**: Focus on writing functions that return consistent results and do not have side effects.
    - **Higher-Order Functions**: Utilization of blocks in Ruby for efficient API implementations.

- **Refactoring Code Examples**:
  - A practical demonstration involving code refactoring to improve clarity and maintainability, including creating separate classes for team and game data for an NFL API wrapper.
  - Advocates for method objects to achieve single-responsibility functions, enhancing readability and testability of the code.

- **Community and Collaboration**:
  - Emphasizes the strength of the Ruby community and the necessity for collaborative innovation in improving Ruby.

#### Significant Examples:

- **Personal Anecdotes**: 
  - References to personal interests, like Japanese culture and Shiba Inu pets, to engage the audience.
  - Humor through anecdotes, such as Aaron Patterson's cat pictures at RubyConf.

#### Conclusions and Takeaways:

- **Future of Ruby**: 
  - As user demands and application complexities rise, Ruby must adapt to retain its place in modern programming.
  - Encouragement to leverage the existing features in Ruby for better performance and maintainability.
  - Final call to action for the community to collaboratively work towards enhancing Ruby's functionality and performance.

Devon Estes concludes by instilling enthusiasm for experimentation and collaboration within the Ruby programming community, ensuring Ruby's ongoing evolution in alignment with technological advancements.

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