popular ruby metaprogramming patterns

1. Popular
Metaprogramming
Patterns in Ruby
Glenn Espinosa

2. Seeing Metaprogramming And Lambda
Function Patterns in Ruby
By Lukas Nimmo

3. “Ruby is beautiful so our
DSLs should be beautiful
(yet extremely powerful)”

4. Metaprogramming
techniques for beautiful DSLs
• Configuration options
• Situational language
• Declarative DSLs
• Flexible interfaces

5. 1. Configuration Options
Goal: Provide global config options for a library

6. Solution: User can specify config options and it will always
configure the Singleton. Using a block makes configuration
explicit.
@gpespn

7. 2. Situational language
Goal: Offer situational language = Flexible interface that
relies on the same implementation

8. Solution: Alias methods for singular & plural implementations,
also consider synonyms (RSpec uses this a lot)

9. 3. Declarative DSL’s
Goal: Declarative DSL's for setting up classes in your
domain with common functionality.

11. 4. Flexible Interfaces
Goal: Allow many entries around the same structure.
Reduce scoping for common functionality.

13. Reduce redundancy for
your users