PHPエンジニアが始めるScala

青山エンジニア勉強交流会～Scala勉強会～
https://techplay.jp/event/640848

Transcript

1. 1)1ΤϯδχΞ ͕࢝ΊΔ 4DBMB
2. ݪ
   ݡଠ )BSB
   ,FOUB  
   
   ۝भ޻ۀେֶେֶӃ
   मྃ 
   ݱࡏ
   גࣜձࣾϑΝϯίϛϡχέʔγϣϯζ 
   
   ۝भ޻ۀେֶ
   ଔۀ
3. 
   
   αʔόαΠυΤϯδχΞͱͯ͠ܞΘΔ εϚʔτϑΥϯ޲͚ΞυωοτϫʔΫ OFOE 
   
   αʔόαΠυΤϯδχΞͱͯ͠ܞΘΔ
4. ΞϓϦ޿ࠂ࿮޲͚ ϏσΦΞυϓϥοτϑΥʔϜ 
   ݱࡏ
   αʔόαΠυΤϯδχΞͱͯ͠ܞΘΔ WJJEMF
5. ܕ ҆ શ ϥ Π ϒ ϥ Ϧ ෆ ม
7. ܕ ҆ શ
8. $account = array( "name" => "fan", "age" => 18 ) BSSBZ Ͱ ΰχϣΰχϣ
9. $account = array( "name" => "fan", "age" => "eighteen" ) ͨ·ʹ 4USJOH
10. case class Account( name: String, age: Int ) Կ͕ೖΔ͔ Ұ໨ྎવ
11. type Name = String type Age = Int case class Account( name: Name, age: Age ) ܕΤΠϦΞε Ͱݟ͑Δੈք
12. type Name = String type Age = Int def hoge(name: Name) : Age = 18 Ҿ਺  ฦΓ஋ Ұ໨ྎવ ίϯύΠϧ࣌ʹ΋ݟͯ͘ΕΔͷͰߋʹ҆৺
13. ܕ ҆ શ DBTF
    DMBTT ܕ Τ Π Ϧ Ξ ε Ҿ ਺  ฦ Γ ஋
14. ܕ ҆ શ DBTF
    DMBTT ܕ Τ Π Ϧ Ξ ε Ҿ ਺  ฦ Γ ஋ ϥ Π ϒ ϥ Ϧ
15. $BLF1)1 Ͱ υϯʂʂ
16. scalaz/ cats બͿ࢟੎͕ ੜ·Εͨ doobie/ ScalikeJDBC ؔ਺ܕϓϩάϥϛϯά %# ૢ࡞
17. ܕ ҆ શ DBTF
    DMBTT ܕ Τ Π Ϧ Ξ ε Ҿ ਺  ฦ Γ ஋ ϥ Π ϒ ϥ Ϧ ࢟ ੎ બ Ϳ ָ ͠ ͞
18. ܕ ҆ શ DBTF
    DMBTT ܕ Τ Π Ϧ Ξ ε Ҿ ਺  ฦ Γ ஋ ϥ Π ϒ ϥ Ϧ ࢟ ੎ બ Ϳ ָ ͠ ͞ ෆ ม
19. $account = array( "name" => "fan", "age" => 18 ) ͍ͭ͜Λ
20. $account = array( "name" => "fan", "age" => 18 ) unset($account["age"]) ͍ͭ͜Λ ͜͏͢Δͱ  όάΒͤ·ͨ͠͝ΊΜͳ͍͞ɺͳΜͰ΋͠·͢
21. val account = Account("fan",18) JNNVUBCMF Ͱ҆৺
22. ܕ ҆ શ DBTF
    DMBTT ܕ Τ Π Ϧ Ξ ε Ҿ ਺  ฦ Γ ஋ ϥ Π ϒ ϥ Ϧ ࢟ ੎ બ Ϳ ָ ͠ ͞ ෆ ม WBM JN N VUBCMF
23. ෆ ม 4DBMB ͷັྗ ͬͯ͜Ε͚ͩʁ
24. val hoge:Option[String] = Some("fan") val fuga:Option[String] = None 0QUJPO JTTFUɺFNQUZ
    
    OVMM
    
    ɺ
    OVMM
25. ෆ ม val hoge:Option[String] = Some("fan") hoge match { case Some(_) => ... case None => ... } NBUDIDBTF JG ͳΜ͍ͯΒͳ͍ ྻڍܕʢTFBMFEʣͰͷ෼ذͩͬͯՄೳ
26. val hoge : Either[Throwable,Int] = Right(18) &JUIFS 3JHIU ͸ SJHIU
27. val hoge: Either[Throwable,Int] ɹɹɹɹɹɹɹɹɹɹ= Right(18) val fuga: Either[Throwable,Int] ɹɹɹɹɹɹɹɹɹɹ= Right(20) for { _ <- hoge _ <- fuga } yield () GPS ճ͢ͷศར
28. val hoge: Either[Throwable,Int] ɹɹɹɹɹɹɹɹɹɹ= Right(18) val fuga: Either[Throwable,Int] ɹɹɹɹɹɹɹɹɹɹ= Right(20) for { _ <- hoge _ <- fuga } yield () GPS ͑  ͳʹ͜Ε
29. val hoge: List[Int] = List(1,2,3) val fuga = hoge.map{ i => i + 1
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    } NBQ ͋  ͋ 
30. val hoge: List[Int] = List(1,2,3) val fuga = hoge.flatMap{ i => List(Option(i + 1)) } qBU.BQ ͋ 
31. val hoge : List[Int] = List(1,2,3) val fuga = hoge.traverse{ ... } USBWFSTF  DBUT ͷ࿩ͳͷͰৄࡉ͸࣍ͷൃදͰʂ
32. ϫλγɺϚμ ॻ͚ΔؾɺγφΠ
33. 0QUJPO NBUDIDBTF &JUIFS NBQ
    qBU.BQ USBWFSTF
34. ࢖Θͳͯ͘΋ ϓϩμΫτͷ ίʔυ͸ॻ͚Δ
35. ܕ ҆ શ DBTF
    DMBTT ܕ Τ Π Ϧ Ξ ε Ҿ ਺  ฦ Γ ஋ ϥ Π ϒ ϥ Ϧ ࢟ ੎ બ Ϳ ָ ͠ ͞ ෆ ม WBM JN N VUBCMF ֶ श ί ε τ
36. XFC ͰؤுΔ υϫϯΰ༷ͷ 4DBMB5FYU IUUQTEXBOHPHJUIVCJPTDBMB@UFYU
37. ຊ ͰؤுΔ 4DBMB εέʔϥϒϧϓϩάϥϛϯά
38. ؤுΒͳ͍ ઌਓͷ஌ܙΛआΓΔ ͜ͷޙ͙͢ʂ
39. ܕ ҆ શ DBTF
    DMBTT ܕ Τ Π Ϧ Ξ ε Ҿ ਺  ฦ Γ ஋ ϥ Π ϒ ϥ Ϧ ࢟ ੎ બ Ϳ ָ ͠ ͞ ෆ ม WBM JN N VUBCMF ֶ श ί ε τ X FC ຊ ઌ ਓ ͷ ஌ ܙ
40. 1)1ΤϯδχΞ ͕࢝ΊΔ 4DBMB