Build to Last - Speaker Deck

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Build to last Build to last How to design rails apps to avoid a rewrite in 5 years

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O HAI

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Super excited!

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ﬁrst post!

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larubyconf noobs?

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rubyconf noobs?

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ruby/rails noobs?

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programming noobs?

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Welcome!

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“the problem”

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“the pain”

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“the rewrite”

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“the question”

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“the answer”

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You’re doing it wrong

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You’re thinking about it wrong

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What is software?

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“instructions for a computer to follow”

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https://mitpress.mit.edu/sicp/

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“Our design of this introductory computer-science subject reﬂects two major concerns…”

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“First, we want to establish the idea that a computer language is not just a way of getting a computer to perform operations but rather that it is a novel formal medium for expressing ideas about methodology…”

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“Thus, programs must be written for people to read, and only incidentally for machines to execute…”

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“Second, we believe that the essential material to be addressed by a subject at this level is not the syntax of particular programming-language constructs, nor clever algorithms for computing particular functions eﬃciently, nor even the mathematical analysis of algorithms and the foundations of computing…”

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“…but rather the techniques used to control the intellectual complexity of large software systems.”

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intellectual complexity

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“Underlying our approach to this subject is our conviction that “computer science” is not a science and that its signiﬁcance has little to do with computers…”

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“The computer revolution is a revolution in the way we think and in the way we express what we think.”

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we think about software wrong

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we express what we think about software wrong

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Big Ball of Mud

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“A big ball of mud is a casually, even haphazardly, structured system…”

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Its organization, if one can call it that, is dictated more by expediency than design.”

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http://www.laputan.org/mud/

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The Big Ball of Mud says: “You are not smart.”

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But you are smart!

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Techical Debt

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https://youtu.be/pqeJFYwnkjE

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Communicate ideas (intellectual complexity) in a better way

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Intent

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(sekrit sauce)

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Anthropomorphization

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Counterintuitive

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Metaphor

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Code neighborhoods

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Domain

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Permissions

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Tests

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Testing is fun!

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Testing is easy!

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(Once you get the hang of it.)

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Testing is how you avoid a rewrite

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“Often people, especially computer engineers, focus on the machines. They think, "By doing this, the machine will run faster. By doing this, the machine will run more eﬀectively. By doing this, the machine will something something something." They are focusing on machines…”

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“But in fact we need to focus on humans, on how humans care about doing programming or operating the application of the machines. We are the masters. They are the slaves.” Yukihiro Matsumoto