Grand Unification Theory: Writing & Running Code

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GRAND UNIFICATION THEORY BRIAN FORD @brixen BARUCO 2012 }WRITING & RUNNING CODE

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RUBINIUS

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I want to change how we write and run code

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debugger proﬁler coverage type checker editor

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Smalltalk

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writing code is a function of running code

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editors push around characters

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The board swam wistfully through the narrow sky.

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Spell checkers

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Autocorrect?

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Programming

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Math Algorithms TDD SOLID Testing Patterns Refactoring Agile Design

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“good design communicates intention”

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com-mu-ni-ca-tion noun the imparting or exchange of information or news

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Implementation Patterns by Kent Beck

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Programming artifacts

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What makes good communication?

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clear adjective obvious or unambiguous

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sim-ple adjective uncomplicated in form, nature or design

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rel-e-vant adjective closely connected or appropriate to the matter at hand

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pre-cise adjective exactness or accuracy of expression or detail

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me-di-um noun a means by which something is communicated or expressed

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tone noun a manner of expression

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safe adjective protected from or not exposed to danger or risk

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open adjective not closed or blocked up free from obstructions

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programming language as medium

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Dynamically Typed Language

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type noun a category of things having common characteristics

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A.const_set :B, 1

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def a.b(x) @b = x end

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A = Class.new

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metaprogramming

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Animal = Object.clone Cat = Animal.clone

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compute with values that pass messages

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Typed

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Dynamic Language

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dynamic languages communicate better

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a.map { |x| x.y }

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a = [1, “x”, nil]

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correctness vs safety

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How do we run code?

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exploratory testing development deployment learning

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Rubinius precise GC concurrency JIT compiler

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$ rbx irb(main):001:0> def hello irb(main):002:1> puts "hi" irb(main):003:1> end => #

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def hello(name) puts “hi #{name}” end

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================ :hello ================ Arguments: 1 required, 0 post, 1 total Arity: 1 Locals: 1: name Stack size: 4 Line: 1 Lines to IP: 0000: push_self 0001: push_literal "hi " 0003: push_local 0 # name 0005: allow_private 0006: meta_to_s :to_s 0008: string_build 2 0010: allow_private 0011: send_stack :puts, 1 0014: ret ----------------------------------------

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What can we do?

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production vs testing

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feature maps

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type analysis

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data ﬂow analysis

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error analysis

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compiled code database

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Challenges

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information display

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data supports decisions

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Do we need tests?

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blinking cursor = blank stare

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in-sight noun the capacity to gain an accurate and deep intuitive understanding of a person or thing