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I ve consulted for a lot of companies over the years. I often see a sad thing happen: the very best coders become architects. It s a pay raise and often a death sentence for those who love to get their hands dirty with code. The architects get to attend meetings, write on white boards, do a few UML diagrams, and do code reviews. While some architects like this kind of work, others pine for the days of code slinging. There is good news for those architects who like to code: Scala offers you a chance to get your hands dirty, because you can express a lot of complex coding rules using Scala s type system. You can be the architect, go to meetings, and use Scala rather than UML to express high-level concepts and complex relationships; and best of all, you don t have to worry about round trips because all the code is Scala. So, let s see how different team members fit into different parts of a project with Scala. A senior developer with a good sense of the business domain and the coding conventions may do well to design domain-specific languages for use by other team members. DSLs deliver value because they allow the program to more closely match the language that business people use to describe solutions in a given domain. As we ve seen with Scala s parser combinator library as well as Specs, Scala makes it easy to create code that corresponds to the language a human would use to describe the answer to a problem. Putting senior developers on projects to design DSLs allows them to model the language of solutions beyond OOP s is a and has a to relations and actions that object can take on each other. Junior developers and folks more comfortable with scripting languages (Ruby, Python, Groovy) are well suited to be library consumers. They can assemble applications out of the DSLs created by the senior developers based on the rules and structures defined by the architects. These developers should have a coding experience that is not dissimilar from that of writing Ruby or Python code. At the same time, the junior developers who have grown up with Java have the comfort of Scala s static type system.
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CHAPTER 9 SCALING YOUR TEAM
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Business people should be able to view the code written using the DSLs as well as the BDD-style tests and understand how the system works. It should be a goal to have business people involved from time to time in code reviews. This provides a two-way feedback system. If your business people understand the code, and they should if the DSLs are well crafted, they will be able to give direct feedback as to the program reflecting the business rules.
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It took me a long time, more than 18 months, until I felt like I was good at Scala. Most programming languages come easily to me, but Scala was not just a programming language; it was a new way of thinking and reasoning about programming. Perhaps if I had taken Lisp courses in college or had formal training in ML-derived languages, Scala s learning curve would not have been so bad for me. That did not deter me from trying to write Scala code, nor did it deter me from working on the Lift Web Framework. Also, there were far fewer books and materials to help me get up to speed with Scala when I started back in November 2006.9 The first step in writing Scala is not being afraid of the fact that Scala s going to warp your brain. The next step in writing Scala is accepting that your code is going to look like Java, Ruby, Python, whatever code for a while. It will take you time and effort and more time to code Scala using the idioms in this book. It will take you time to design code that fits into Scala paradigms and to discover and devise paradigms of your own. It will take your team members time as well. In this section, I m going to talk about coding activities and questions and styles that you can apply to your code as well as suggest to team members when you re doing code reviews on this code. So, write that Java-style code in Scala and then apply the concepts below and see how your code changes and how your thought patterns change.
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