Metaprogramming patterns

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Glenn Espinosa

popular ruby metaprogramming patterns

Logiciels

Popular
Metaprogramming
Patterns in Ruby

Glenn Espinosa

Seeing Metaprogramming And Lambda
Function Patterns in Ruby

By Lukas Nimmo

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

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

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

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

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

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

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

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

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Metaprogramming patterns

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.

10.

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

12.

13. Reduce redundancy for your users

Metaprogramming patterns

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