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Swift Programming in Japanese

Avatar for FlipByBlink FlipByBlink
April 10, 2025
Programming
0
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Swift Programming in Japanese

In Swift, you can define identifiers not only in English but also in various natural languages.
Recently, I released a Shogi app for all Apple platforms, including Apple Vision Pro. In this app, I wrote almost all identifiers in Japanese—except for reserved words and imported frameworks.
In this talk, I'll share insights from my experience with Swift programming using Japanese identifiers.
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FlipByBlink

April 10, 2025
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Transcript

  1. 3ZP:BNBTIJUB 4PMP%FWFMPQFSGPSJ04 XBUDI04 NBD04 BOEWJTJPO04 4XJGU1SPHSBNNJOH JO+BQBOFTF

  2. w 1SPHSBNNJOHIBTBIJTUPSZPGPWFSZFBST w )JTUPSJDBMMZ TPVSDFDPEFIBTCFFOXSJUUFOJO&OHMJTI w 5IBOLTUP6OJDPEF NPEFSOQSPHSBNNJOHMBOHVBHFTTVQQPSU XSJUJOHTPVSDFDPEFJOOBUVSBMMBOHVBHFTPUIFSUIBO&OHMJTI w

    4XJGUJTBNPEFSOQSPHSBNNJOHMBOHVBHFUIBUXBTMBVODIFE ZFBSTBHP w *USJFE4XJGUQSPHSBNNJOHJO+BQBOFTF

  3. 1MBJO4IPHJ w #PBSEHBNFBQQ w 3FMFBTFE w 9DPEF 4XJGU 4XJGU6*

  4. None
  5. None
  6. None
  7. None

  8. "MM"QQMFQMBUGPSNTTVQQPSU

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  10. 8IBU`T4IPHJ w "USBEJUJPOBM+BQBOFTFTUSBUFHZ CPBSEHBNF w 1MBZFEPOBYCPBSEXJUI VOJRVFQJFDFNPWFNFOUSVMFT w ,OPXOBTl+BQBOFTFDIFTTz

  11. UZQFTPGQJFDFT

  12. &YBNQMFDPEF

  13. None

  14. "MNPTUFWFSZUIJOHJTJO+BQBOFTF

  15. l4XJGUQSPHSBNNJOHJO+BQBOFTFz w 4XJGUTPVSDF fi MFTBSFFODPEFEJO65' w 4XJGUJTEFTJHOFEUPBMMPXOPO&OHMJTIJEFOUJ fi FST w

    3FTFSWFEXPSETBOEGSBNFXPSLJEFOUJ fi FSTSFNBJOJO&OHMJTI w 6TJOH+BQBOFTFGPSOBNJOHJEFOUJ fi FST

  16. 1SFNJTFPGUIJTUBML w .BD w 9DPEF w 4XJGU w "QQMF`TEFWFMPQNFOUUPPMTBOEGSBNFXPSLTPOMZ w

    /PTQFDJBMUPPMTBOEDPO fi HT w #BTFEPOTQFBLFS`TQFSTPOBMFYQFSJFODF

  17. Out of Scope for This Talk • Advantages and disadvantages

    of non-English speakers using their native language for programming. • Whether non-English speakers should program in English.

  18. 'FBTJCJMJUZPG +BQBOFTFJEFOUJ fi FST

  19. 7BMJEDIBSBDUFST

  20. *OWBMJEDIBSBDUFS w9DPEFQSFTFOUTFSSPSNFTTBHFTBTZPVXSJUFDPEF w'BJMFEUPDPNQJMF

  21. $BUFHPSJFTPGDIBSBDUFST

  22. )JSBHBOBDIBSBDUFST ͋ ͍ ͏ ͑ ͓  ͔ ͖ ͘

    ͚ ͜  ͞ ͠ ͢ ͤ ͦ  ͨ ͪ ͭ ͯ ͱ  ͳ ʹ ͵ Ͷ ͷ  ͸ ͻ ; ΁ ΄  · Έ Ή Ί ΋  ΍ ɹ Ώ ɹ Α  Β Γ Δ Ε Ζ  Θ ɹ Λ ɹ Μ 5IFNPTUCBTJDUZQFTPG+BQBOFTFDIBSBDUFST

  23. )JSBHBOBDIBSBDUFST ✔"MM0, 5IFNPTUCBTJDUZQFTPG+BQBOFTFDIBSBDUFST

  24. Ξ Π ΢ Τ Φ  Χ Ω Ϋ έ

    ί  α γ ε η ι  λ ν π ς τ  φ χ ψ ω ϊ  ϋ ώ ϑ ϔ ϗ  Ϛ ϛ Ϝ ϝ Ϟ  Ϡ ɹ Ϣ ɹ Ϥ  ϥ Ϧ ϧ Ϩ ϩ  ϫ ɹ Ϯ ɹ ϯ ,BUBLBOBDIBSBDUFST 4JNJMBSJOVTBHFUPJUBMJDGPOUTJO&OHMJTI

  25. ,BUBLBOBDIBSBDUFST ✔"MM0, 4JNJMBSJOVTBHFUPJUBMJDGPOUTJO&OHMJTI

  26. $IJOFTFDIBSBDUFSTBEPQUFEJOUP+BQBOFTFXSJUJOHTZTUFN Ұ ӈ Ӎ ԁ Ԧ Ի Լ Ր Ֆ

    ֋ ֶ ؾ ۝ ٳ ۄ ۚ ۭ ݄ ݘ ݟ ޒ ޱ ߍ ࠨ ࡾ ࢁ ࢠ ࢛ ࢳ ࣈ ࣖ ࣣ ं ख े ग़ ঁ খ ্ ৿ ਓ ਫ ਖ਼ ੜ ੨ ༦ ੴ ੺ ઍ ઒ ઌ ૣ ૲ ଍ ଜ େ உ ஛ த ஬ ொ ఱ ా ౔ ೋ ೔ ೖ ೥ ന ീ ඦ จ ໦ ຊ ໊ ໨ ཱ ྗ ྛ ࿡ ,BOKJDIBSBDUFST

  27. ✔"MM0, ,BOKJDIBSBDUFST $IJOFTFDIBSBDUFSTBEPQUFEJOUP+BQBOFTFXSJUJOHTZTUFN

  28. ɻ ɺ ʔ ～ ～ ʍ ʎ ʋ ʌ ʑ

    ʒ ʃ ʄ ɾ 㽍 ˇ ʢ ʣ ˋ ˍ ʮ ʯ ʰ ʱ ʲ ʳ ʂ ʁ ˞ Š ⋯ ʏ 4ZNCPMDIBSBDUFST

  29. ✔WBMJEDIBSBDUFST JOWBMJEDIBSBDUFST 4ZNCPMDIBSBDUFST

  30. w JOWBMJEDIBSBDUFST w $PNNBBOE1FSJPE w #SBDLFUT w 4ZNCPMTXSJUUFOBUUIFCFHJOOJOHPSFOE PGBTFOUFODF w

    5IFTFBSFHFOFSBMMZVOOFDFTTBSZGPS JEFOUJ fi FST *OWBMJE+BQBOFTFTZNCPMT ɻ *EFPHSBQIJD'VMM4UPQ ɺ *EFPHSBQIJD$PNNB ʮ -FGU$PSOFS#SBDLFU ʯ 3JHIU$PSOFS#SBDLFU ʰ -FGU8IJUF$PSOFS#SBDLFU ʱ 3JHIU8IJUF$PSOFS#SBDLFU ʲ -FGU#MBDL-FOUJDVMBS#SBDLFU ʳ 3JHIU#MBDL-FOUJDVMBS#SBDLFU ˞ 3FGFSFODF.BSL ⋯ .JEMJOF)PSJ[POUBM&MMJQTJT ʏ %JUUP.BSL Š &N%BTI* not prolonged sound mark ～ 8BWF%BTI* FullWidth-Tilde is valid

  31. $IBSBDUFSTUIBUBSFJOUFOEFEUPNPEJGZPUIFSDIBSBDUFST ͋ ʃ→͋㿆  τ ʄ→ ト゚ $PNCJOJOHDIBSBDUFSDIBSBDUFST U+3099 U+309A

  32. $IBSBDUFSTUIBUBSFJOUFOEFEUPNPEJGZPUIFSDIBSBDUFST $PNCJOJOHDIBSBDUFSDIBSBDUFST ✔"MM0, ͋ ʃ→͋㿆  τ ʄ→ ト゚ U+3099

    U+309A

  33. B C D E F G H I J K

    L M N O P Q R S T U V W X Y Z [  " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; "MQIBCFUDIBSBDUFST ✔"MM0,

  34.          

    "SBCJDOVNFSBMTDIBSBDUFST ✔"MM0,

  35. +BQBOFTFDIBSBDUFST DBUFHPSZ DPVOU ✔ )JSBHBOB  ✔ ,BUBLBOB  ✔

    ,BOKJ  4ZNCPM  ✔ "MQIBCFU  ✔ "SBCJDOVNFSBMT  ✔ $PNCJOJOHDIBSBDUFS 

  36. +BQBOFTFDIBSBDUFST 3BSFMZVTFEJOQSBDUJDF * roughly estimation DBUFHPSZ DPVOU ✔ )JSBHBOB 

    and  ✔ ,BUBLBOB  and  ✔ ,BOKJ  and  4ZNCPM  and  ✔ "MQIBCFU  and  ✔ "SBCJDOVNFSBMT  and  ✔ $PNCJOJOHDIBSBDUFS 

  37. +BQBOFTFDIBSBDUFST "MNPTUBMM+BQBOFTF DIBSBDUFSTBSFWBMJE *OWBMJEDIBSBDUFSTBSF POMZTPNFTZNCPMT UPUBM  DBUFHPSZ DPVOU ✔

    )JSBHBOB  and  ✔ ,BUBLBOB  and  ✔ ,BOKJ  and  4ZNCPM  and  ✔ "MQIBCFU  and  ✔ "SBCJDOVNFSBMT  and  ✔ $PNCJOJOHDIBSBDUFS 

  38. $IBSBDUFST 4XJGUDPNQJMFS

  39. w #VHHZ  w *TUIFCFIBWJPSEJ ff FSFOUJO&OHMJTI  w 1FSGPSNBODFESPQ

    /PQSPCMFN %PFT4XJGUDPNQJMFSCVJMEQSPQFSMZ

  40. $IBSBDUFST 4XJGUDPNQJMFS 9DPEF

  41. w %PFTJUGVODUJPOQSPQFSMZBT+BQBOFTFUFYUFEJUPS  w %PTVHHFTUJPOTBOEPUIFSGFBUVSFTXPSLTNPPUIMZ  w *TUIFSFBOZDPO fl JDUXJUI+BQBOFTF*.&DPOWFSTJPO

     w %PFTJUEJTQMBZ+BQBOFTFGPOUDPSSFDUMZ  w 8PO`UHBSCMFEUFYUPDDVS  w 8PO`UJUBDDJEFOUBMMZEJTQMBZ$IJOFTFTUZMFGPOUEFTJHO  w "SF fi MFOBNFTIBOEMFEQSPQFSMZ  w *TCVJMUJO(JUJO9DPEFBMTPXPSLJOH fi OF %PFT9DPEFXPSLQSPQFSMZ /PQSPCMFN

  42. $IBSBDUFST 4XJGUDPNQJMFS 5FTUPO9DPEF 9DPEF

  43. 5FTUPO9DPEF XCTestSFRVJSFTJEFOUJ fi FSTUPCFHJOXJUI“test”

  44. 5FTUPO9DPEF *OSwift TestingJOUSPEVDFEJO9DPEF  UIFSF`TOPOFFEUPQSF fi YXJUI“test”

  45. $IBSBDUFST 4XJGUDPNQJMFS 5FTUPO9DPEF 9DPEF

  46. *OTIPSU  4XJGUBOE9DPEF GVMMZTVQQPSUQSPHSBNNJOH XJUI+BQBOFTFJEFOUJ fi FST

  47. 24P EPFTFWFSZUIJOHXPSL QFSGFDUMZJO+BQBOFTF "/P

  48. 6TJOH+BQBOFTFPVUTJEFPG4XJGUDBOCFSJTLZ w 9DPEFQSPKFDUOBNF w #VOEMF*EFOUJ fi FS w /BNFPG'JMF 'PMEFS

    PS5BSHFU * Only when using third-party development tools w 63- w $PEBCMF * Only when decoding the data with other tools

  49. 5JQTGPSDPEFDPNQMFUJPO

  50. 5JQTGPSDPEFDPNQMFUJPO *TTVF6OMJLFJO&OHMJTI JUSFRVJSFTNVMUJLFZTUSPLFTJO+BQBOFTF → → →

  51. 5JQTGPSDPEFDPNQMFUJPO /P%JTQMBZDPEFDPNQMFUJPOVTJOHLFZCPBSETIPSUDVU *TTVF6OMJLFJO&OHMJTI JUSFRVJSFTNVMUJLFZTUSPLFTJO+BQBOFTF

  52. 5JQTGPSDPEFDPNQMFUJPO /P6TJOH“self”PS“Self”IFMQTDPEFDPNQMFUJPOXPSLTNPPUIMZ *TTVF6OMJLFJO&OHMJTI JUSFRVJSFTNVMUJLFZTUSPLFTJO+BQBOFTF

  53. "NFEJVNTJ[FJTTVF /BNJOHDPOWFOUJPO

  54. "NFEJVNTJ[FJTTVF $BTFDPOWFOUJPOTBSFDPNNPO/BNFTPGUZQFTBOEQSPUPDPMTBSF UpperCamelCase&WFSZUIJOHFMTFJTlowerCamelCase /BNJOHDPOWFOUJPO

  55. "NFEJVNTJ[FJTTVF $BTFDPOWFOUJPOTBSFDPNNPO/BNFTPGUZQFTBOEQSPUPDPMTBSF UpperCamelCase&WFSZUIJOHFMTFJTlowerCamelCase /BNJOHDPOWFOUJPO )PXFWFS UIFSFJTO`UBXFMMFTUBCMJTIFEXBZUPFYQSFTTUIFTF DPOWFOUJPOTJO+BQBOFTF

  56. "NFEJVNTJ[FJTTVF $BTFDPOWFOUJPOTBSFDPNNPO/BNFTPGUZQFTBOEQSPUPDPMTBSF UpperCamelCase&WFSZUIJOHFMTFJTlowerCamelCase /BNJOHDPOWFOUJPO )PXFWFS UIFSFJTO`UBXFMMFTUBCMJTIFEXBZUPFYQSFTTUIFTF DPOWFOUJPOTJO+BQBOFTF * This issue

    applies to other programming languages as well *USJFEWBSJPVTXBZTBOETFBSDIFEPOMJOF CVUDPVMEO`U fi OEBTPMVUJPO

  57. As an aside

  58. As an aside High quality translation "QQMFUSBOTMBUFTNVDIPGP ff i DJBMJOGPSNBUJPOGPSEFWFMPQFSTJOUP+BQBOFTF

  59. As an aside w 5PQQBHF "QQMFUSBOTMBUFTNVDIPGP ff i DJBMJOGPSNBUJPOGPSEFWFMPQFSTJOUP+BQBOFTF

  60. As an aside w 5PQQBHF w 'FBUVSFQBHF "QQMFUSBOTMBUFTNVDIPGP ff i

    DJBMJOGPSNBUJPOGPSEFWFMPQFSTJOUP+BQBOFTF

  61. As an aside w 5PQQBHF w 'FBUVSFQBHF w /FXT "QQMFUSBOTMBUFTNVDIPGP

    ff i DJBMJOGPSNBUJPOGPSEFWFMPQFSTJOUP+BQBOFTF

  62. As an aside w 5PQQBHF w 'FBUVSFQBHF w /FXT w

    7JEFP UJUMF EFTDSJQUJPO TVCUJUMFT "QQMFUSBOTMBUFTNVDIPGP ff i DJBMJOGPSNBUJPOGPSEFWFMPQFSTJOUP+BQBOFTF

  63. w 5PQQBHF w 'FBUVSFQBHF w /FXT w 7JEFP UJUMF EFTDSJQUJPO

    TVCUJUMFT  w )VNBO*OUFSGBDF(VJEFMJOFT As an aside "QQMFUSBOTMBUFTNVDIPGP ff i DJBMJOGPSNBUJPOGPSEFWFMPQFSTJOUP+BQBOFTF

  64. w 5PQQBHF w 'FBUVSFQBHF w /FXT w 7JEFP UJUMF EFTDSJQUJPO

    TVCUJUMFT  w )VNBO*OUFSGBDF(VJEFMJOFT As an aside These provide strong support for Japanese speakers, especially in keeping up with OS updates + new devices. "QQMFUSBOTMBUFTNVDIPGP ff i DJBMJOGPSNBUJPOGPSEFWFMPQFSTJOUP+BQBOFTF

  65. As an aside w 5PQQBHF w 'FBUVSFQBHF w /FXT w

    7JEFP UJUMF EFTDSJQUJPO TVCUJUMFT  w )VNBO*OUFSGBDF(VJEFMJOFT /PUSBOTMBUJPO w developer.apple.com/documentation "1*3FGFSFODF 4BNQMFDPEF "SUJDMF FUD * mostly w 5VUPSJBMTFSJFT w 9DPEF`T6* "QQMFUSBOTMBUFTNVDIPGP ff i DJBMJOGPSNBUJPOGPSEFWFMPQFSTJOUP+BQBOFTF

  66. As an aside As an aside (2) 5IF4XJGU1SPHSBNNJOH-BOHVBHF ೔ຊޠ൛ 

    www.swiftlangjp.com 7PMVOUFFSUSBOTMBUFE+BQBOFTFWFSTJPO PGUIFP ffi DJBM4XJGUMBOHVBHFSFGFSFODF w 5PQQBHF w 'FBUVSFQBHF w /FXT w 7JEFP UJUMF EFTDSJQUJPO TVCUJUMFT  w )VNBO*OUFSGBDF(VJEFMJOFT /PUSBOTMBUJPO w developer.apple.com/documentation "1*3FGFSFODF 4BNQMFDPEF "SUJDMF FUD * mostly w 5VUPSJBMTFSJFT w 9DPEF`T6* "QQMFUSBOTMBUFTNVDIPGP ff i DJBMJOGPSNBUJPOGPSEFWFMPQFSTJOUP+BQBOFTF

  67. 3FRVFTU

  68. 3FRVFTUUP /PUIJOH 4XJGUBOE9DPEF

  69. 3FRVFTUUP /PUIJOH 4XJGUBOE9DPEF No need to be changed into Japanese:


    Reserved words, Framework identi fi ers, Xcode’s UI

  70. -FU`TXSJUF+BQBOFTFJEFOUJ fi FST w /PQSFQBSBUJPOJTSFRVJSFECFDBVTFJUTQVSF4XJGU w :PVDBOXSJUFBMPOHTJEF&OHMJTI BMMPXJOHHSBEVBMJOUSPEVDUJPO w -FU`T

    fi OEUIFCFTUQSBDUJDFTUPHFUIFS&TQFDJBMMZOBNJOHDPOWFOUJPO +BQBOFTFTQFBLFST 3FRVFTUUP

  71. 8SBQVQ w 4XJGUXPSLTQSPQFSMZXJUI+BQBOFTFJEFOUJ fi FST w *U`TVOTBGFUPVTF+BQBOFTFPVUTJEF4XJGU w -FU`TUSZ4XJGUQSPHSBNNJOHJO+BQBOFTF date:

    2025-04 title: Swift Programming in Japanese