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How I Spent All My Savings Reinventing Programming Luis Solano @luisobo

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I’ve seen things

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¿The Best Way™?

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Design patterns Unit testing TDD Code reviews Pair programming

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!

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MUTABLE STATE & CONTROL FLOW

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Mutable state & Control flow

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PROGRAMMING WAS NEVER INVENTED

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PROGRAMMING WAS NEVER INVENTED PROGRAMMING WAS NEVER INVENTED PROGRAMMING WAS NEVER INVENTED PROGRAMMING WAS NEVER INVENTED PROGRAMMING WAS NEVER INVENTED PROGRAMMING WAS NEVER INVENTED PROGRAMMING WAS NEVER INVENTED PROGRAMMING WAS NEVER INVENTED

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What would programming be in an ideal world?

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“Hey Siri, make me a TODO app”

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No accidental complexity Declarative, intentional Helps discover requirements Easy evolution of programs No need for a team Shared context

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hello.swift 10010010110010100 10011011101100101 00100100100101011 00100101100101001 00110111011001010 010010010010101 Compiler executable

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10010010110 01010010011 01110110010 10010010010 01010110010 01011001010 Compiler Prod A P I Stg A P I Dev A P I v1 v2 v3

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E7 E1 E6 E5 E4 E3 E2

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ESSENTIAL ACCIDENTAL

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ESSENTIAL ACCIDENTAL Inherent complexity of the problem that exist before adding computers to the mix The rest of the complexity, added by the computer

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"

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E7 E1 E6 E5 E4 E3 E2

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ONE GENERAL-PURPOSE LANGUAGE

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MANY DOMAIN-SPECIFIC LANGUAGES

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HTML CSS #user-grid .nav-button h3 tr:nth-child(2n) ul.todo li

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domain Twitter { entity User { username : String email : String tweets : Many[Tweet] following : Many[User] timeline <= Tweet.where(author in following) } entity Tweet { text : String author : User } } DOMAIN MODELLING

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persistance { domain Twitter { database: MySQL query User.timeline { materialize: true consistency: eventual database: Cassandra } } } ACCIDENTAL STUFF

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ACCIDENTAL STUFF

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E7 E1 E6 E5 E4 E3 E2

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Source editing ViewController.swift

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Source editing ViewController.swift import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } Source editing

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Source editing ViewController.swift 1001001011001 0100100110111 0110010100100 1001001010110 0100101100101 0010011011101 1001010010010 010010101 Executable Compiler if (a > 2) { performA() } else { performB() }

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Projectional editing MyProgram.ast

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Projectional editing MyProgram.ast Editor render if (a > 2) { performA() } else { performB() }

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Projectional editing MyProgram.ast Editor render if (a > 2) { performA() } else { performB() } E1 update

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if (a > 2) { performA() } else { performB() } Projectional editing MyProgram.ast Editor render if (a > 2) { performA() } else { } update E1

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Projectional editing MyProgram.ast Editor render update

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Projectional editing MyProgram.ast Editor render update

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Projectional editing MyProgram.ast Editor render update

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Projectional editing MyProgram.ast Editor render update

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Projectional editing MyProgram.ast Editor render update func calculate(z) { }

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Projectional editing MyProgram.ast Editor render update class Subscription { }

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Projectional editing func myFunction() -> Int { return 2 + 2 } 123 728 662 918 331 092 MyProgram.ast

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https://www.jetbrains.com/mps/

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E7 E1 E6 E5 E4 E3 E2

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E7 E1 E6 E5 E4 E3 E2

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Projectional editing E1 E2 E3 E4 E5 E6 E7 E8 E9

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10010010110 01010010011 01110110010 10010010010 01010110010 01011001010 Compiler Prod A P I Stg A P I Dev A P I v1 v2 v3

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E1 E2 E3 E4 E5 10010010110010100 10011011101100101 00100100100101011 00100101100101001 00110111011001010 010010010010101 Compiler executable 10010010110010100 10011011101100101 00100100100101011 00100101100101001 00110111011001010 010010010010101 DB migrations 10010010110010100 10011011101100101 00100100100101011 00100101100101001 00110111011001010 010010010010101 Deploy scripts

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domain Twitter { entity User { username : String email : String tweets : Many[Tweet] following : Many[User] timeline <= Tweet.where(author in following) } entity Tweet { text : String author : User } } DOMAIN MODELLING

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LIVE PROGRAMMING

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in conclusión

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“We Shape Our Tools, and Then Our Tools Shape Us” – Marshall McLuhan

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Thank you! @luisobo