I downloaded the green paper "Dependency Injection: what’s all the hype?" from the books website and it says it is from
"Dependency Injection; With examples in Java, Ruby, and C#".
The book's subtitle on the website is "Design patterns using Spring and Guice". What happened to the Ruby and C# bits?
I've mostly seen DI discussed for use with Java. Is it as useful for other languages such as Ruby? (Some people think no, cf.
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