Developer Guide to Migrate Across Galaxies

Presentation given in App Builders 2017, Lausanne, Switzerland.

Speech:
https://akos.ma/blog/the-developer-guide-to-migrate-across-galaxies/

Transcript

1. Developer Guide To
   Migrate Across Galaxies.
   

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3. Galaxies.
   

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5. "2. Choose Your Galaxy
   Wisely"
   

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6. "In our industry, every
   technology generates what I call
   a “galaxy.” These galaxies feature
   stars but also black holes; …
   

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7. …meteoric changes that fade in
   the night, many planets, only a
   tiny fraction of which harbour
   some kind of life, and lots of
   cosmic dust and dark matter."
   

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8. Religion.
   

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9. Sociology.
   

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10. 6 Galaxies.
    

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11. In just half an hour.
    

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12. Believe me.
    

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13. Everything is connected.
    

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14. 42.
    

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15. 1. Perl, Python, PHP, Ruby.
    aka Babelia.
    

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16. Quality software.
    

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17. Actually…
    

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18. Not.
    

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19. Software rots.
    

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20. Organic Software™®©.
    

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21. Hipsters.
    

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32. Software Vendors.
    

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34. Windows-1252.
    

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35. \lim_{k \to \infty}\frac{1}{k} = 0.
    

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36. View Slide

37. 
    
    lim
    
    k
    →
    ∞
    
    
    
    1
    k
    
    =
    0.
    
    

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39. 2017.
    

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40. LibreOffice.
    

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41. AbiWord.
    

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43. Déjà Vu.
    

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46. Apple Pages 2005.
    

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47. Déjà Vu.
    

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48. Markdown.
    

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50. AsciiDoc.
    

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51. UTF-8.
    

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52. Գ΄Ӿ΄ᢚय़
    ၹΨᎣΟͰ̶
    

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54. Perl ➡ Markdown.
    

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55. PHP ➡ Textile.
    

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56. Python ➡ AsciiDoc.
    

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57. Ruby ➡ AsciiDoctor.
    

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58. Haskell ➡ Pandoc.
    

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59. AsciiDoc, Markdown ➡
    Pandoc ➡
    PDF, Word, LibreOffice…
    

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60. 2. VBScript.
    aka Apocalypsia.
    

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61. On Error Resume Next
    Err.Raise 6
    MsgBox CStr(Err.Number) & " " & Err.Description
    Err.Clear
    

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70. "In earlier version of Visual
    Basic, functions without a
    "Return" statement just "Return
    None", without any kind of
    compiler warning (or error)…
    

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71. Function Sum(value1, value2)
    Dim result
    result = value1 + value2
    Sum = result
    End Function
    

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73. "Oh man this sucked."
    

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74. Class Customer
    Private m_CustomerName
    Private Sub Class_Initialize
    m_CustomerName = ""
    End Sub
    ' CustomerName property.
    Public Property Get CustomerName
    CustomerName = m_CustomerName
    End Property
    Public Property Let CustomerName(newValue)
    m_CustomerName = newValue
    End Property
    End Class
    Dim cust
    Set cust = New Customer
    cust.CustomerName = "Fabrikam, Inc."
    Dim s
    s = cust.CustomerName
    MsgBox (s)
    

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75. "the ASP server is multithreaded
    and assigns a different thread to
    each page request (…). VBScript
    class instances (…) must run on
    the thread that created them."
    

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76. "There is no notion of
    polymorphism or inheritance in
    VBScript 5.0 (…)"
    

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77. "(…) VBScript classes are merely a
    way to group data and the
    operations on the data together
    to improve encapsulation."
    

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78. "The four magic constants of the
    apocalypse: Nothing, Null,
    Empty, and Error."
    

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79. Option Explicit
    Dim MyVar
    MyVar = 10
    ' ... and your code explodes (because not declared)!
    MyInt = 10
    

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80. VBRUN300.DLL.
    400 KB.
    

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81. .NET Framework.
    23 MB4.
    4 https://www.microso!.com/en-us/download/details.aspx?id=26
    

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82. Swift.
    8 – 15 MB5.
    5 http://stackoverflow.com/q/28275711/133764
    

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83. Kotlin.
    858 KB2.
    2 https://kotlinlang.org/docs/tutorials/kotlin-android.html
    

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84. 3. C++.
    aka Paradigmia.
    

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87. Macros
    Multiple inheritance.
    Template Metaprogramming.
    Standard Template Library.
    

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88. Multiple Inheritance.
    

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89. !.
    

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90. Once Again.
    

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91. Everybody.
    

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92. Multiple.
    Inheritance.
    

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93. !.
    

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94. Interfaces & Protocols.
    are.
    Abstract Classes with Virtual Methods.
    

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95. Cut And Paste.
    

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96. 500 KLOC.
    

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97. 4 hours build.
    

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98. (Do. Not. Clean.)
    

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99. 4000 Tests.
    

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100. VBScript ➡ Excel.
     

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102. 4. Objective-C.
     aka Coolia.
     

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106. Seat>
     

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107. std::map, std::vector>
     

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108. Cup.
     

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109. public:
     external auto static auto auto(auto &ref) [&auto] {
     return auto_cast (*auto) auto;
     }
     

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112. !.
     

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118. exampleWithNumber: x
     | y |
     true & false not & (nil isNil) ifFalse: [self halt].
     y := self size + super size.
     #($a #a "a" 1 1.0)
     do: [ :each |
     Transcript show: (each class name);
     show: ' '].
     ^x < y
     

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122. Person *p = [[Person alloc] init];
     p.name = @"Steve";
     NSLog([p valueForKey:@"name"]);
     

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124. (secret)
     

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126. ABI
     

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127. 5. JavaScript.
     aka Undefinedia.
     

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129. V10 = Lars_Bak(JavaScript);
     

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132. CoffeeScript, LiveScript,
     TypeScript, Kotlin, UberScript,
     ToffeeScript, Mascara,
     Objective-J, Script#…
     

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133. 6. Swift.
     aka Migrania.
     

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135. JVM.
     

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136. CLR.
     

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137. ABI.
     

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138. COM.
     

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139. "…a binary-interface standard
     for software components
     introduced by Microsoft in 1993
     (…)"
     

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140. "(…) used to enable inter-process
     communication and dynamic
     object creation in a large range
     of programming languages."
     

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143. HRESULT CMyMAPIObject::QueryInterface (REFIID riid,
     LPVOID * ppvObj)
     {
     // Always set out parameter to NULL, validating it first.
     if (!ppvObj)
     return E_INVALIDARG;
     *ppvObj = NULL;
     if (riid == IID_IUnknown || riid == IID_IMAPIProp ||
     riid == IID_IMAPIStatus)
     {
     // Increment the reference count and return the pointer.
     *ppvObj = (LPVOID)this;
     AddRef();
     return NOERROR;
     }
     return E_NOINTERFACE;
     }
     

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144. Reference Counting!
     ULONG CMyMAPIObject::AddRef()
     {
     InterlockedIncrement(m_cRef);
     return m_cRef;
     }
     ULONG CMyMAPIObject::Release()
     {
     // Decrement the object's internal counter.
     ULONG ulRefCount = InterlockedDecrement(m_cRef);
     if (0 == m_cRef)
     {
     delete this;
     }
     return ulRefCount;
     }
     

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145. F#, JRuby, Kotlin, Scala.
     

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146. LLVM.
     

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147. !
     

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148. Xcode Migration
     Assistants.
     

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149. File Radars.
     

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150. Crash.
     

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151. iCloud.
     

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152. reStructuredText ➡ Markdown.
     

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154. iTunes.
     

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155. CPU.
     

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156. Memory.
     

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157. Hog.
     

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158. Merging Storyboards.
     

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159. Touch Bar.
     

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161. 7. Local Cluster.
     aka Here. Now.
     

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162. "My recommendation to you is"
     

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163. "(…) choose your galaxy wisely,
     (…) keep your telescope pointed
     towards the other galaxies, and
     prepare to make a hyperjump to
     other places if needed."
     

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164. Convergence.
     

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165. C++17.
     PHP 7.
     C# 6.
     ES 6.
     Java 9.
     Kotlin 1.1.
     Swi! 3.1.
     Scala 2.12.
     

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166. य़ݶੜ吖
     

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167. Lambdas.
     Type inference.
     Traits / default methods / protocol extensions /
     multiple inheritance / mixins / optional interface
     implementations.
     Categories / extensions.
     

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170. Singularity.
     

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171. Πάντα χωρεῖ
     καὶ οὐδὲν µένει
     — Ἡράκλειτος
     

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172. Everything changes and nothing
     stands still.
     — Heraclitus of Ephesus (535 - 475 BC)
     

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173. "Plus ça change, plus c'est la
     même chose."
     — Jean-Baptiste Alphonse Karr (1808 - 1890)
     

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175. Micromanagement.
     No accessibility.
     Discrimination.
     Pseudoscrum.
     Open Spaces.
     Harassment.
     No testing.
     Burnout.
     

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176. 8. Guardians of the
     Galaxy
     aka You.
     

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177. Ownership.
     

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178. Empathy.
     

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179. Refuse jobs without
     inclusion and diversity.
     

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180. Refuse jobs in open spaces.
     

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181. Do not release code
     without tests.
     

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182. Do not release
     unaccessible apps.
     

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183. Do not accept bullshit
     from App Store owners.
     

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184. Do not jump into
     proprietary lock-in.
     

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185. It is not the programming language.
     It is not the frameworks.
     It is not the patterns.
     It is us.
     

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187. Trip > Destination.
     

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188. ᜰ澆氱์
     

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189. @akosma.
     aka Me.
     

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190. Thanks.
     

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