Kotlin学習とライブラリ作成

ライブラリ作成をしながらKotlinを学習するといいんじゃないかなーという話です

1. ,PUMJOֶशͱϥΠϒϥϦ࡞੒ 2016 03 24 @ Sansan Toshihiro Yagi
2. About Me Toshihiro Yagi Twitter : sys1yagi Programmer at Cookpad Inc. Android engineer Kotlin͸2014೥ॳ಄ลΓ͔ΒŧŔŕŪ৮͍ͬͯΔఔ౓
3. Target & Agenda ,PUMJOֶशͷͨΊʹϥΠϒϥϦ࡞ͬͯΈΔͷ͸݁ ߏ͍͍Μ͡Όͳ͍͔ͳʔͱ͍͏࿩Ͱ͢ɻ
   LNPDLJUPͱ͍͏ϥΠϒϥϦͱڞʹ࡞੒࣌ʹ࢖ͬ ͨ,PUMJOͷػೳͳͲΛ঺հ͠·͢ɻ
   ,PUMJOͷجຊతͳݴޠͷػೳ͸஌͍ͬͯͯ,PUMJO Λ࢖ͬͯ۩ମతʹͲ͏͍ͬͨࣄ͕Ͱ͖ͦ͏͔ͳ͊ʔ ͱߟ͍͑ͯΔਓ޲͚
4. What is kmockito?
5. Wrapper of Mockito for Kotlin NPDL
   WBS
   JUFN*UFN
   
   NPDL
   XIFO
   JUFNMFOHUI JOWPLFEUIFO3FUVSO 
   BOTXFS
   JUFNTPNF.FUIPE BOZ*OU
   BOZ4USJOH
   BOZ
   BOZ
   
   
   
   
   JOWPLFE
   
   
   
   
   UIFO"OTXFS
   \
   
   
   
   
   
   
   WBM
   B
   C
   D
   E
   
   JUBSHVNFOUT*OU
   4USJOH
   *UFN
   /BNF
   
   
   
   
   
   
   
   EP
   TPNFUIJOH
   
   
   
   
   ^
   WFSJGZ
   JUFNWFSJGZ UJNFT  MFOHUI https://github.com/sys1yagi/kmockito
6. Motivation
7. bXIFO`
   ͸
   ,PUMJO
   ͷ༧໿ޠ WBM
   JUFN
   
   NPDL *UFNDMBTTKBWB
   AXIFOA JUFNMFOHUI UIFO3FUVSO  ༧໿ޠͱඃΒͳ͍Α͏ʹΤεέʔϓ͕ඞཁ ৑௕
8. BOZ
   ͕
   OVMM
   Λฦ͢ AXIFOA JUFNMFOHUI BOZ UIFO3FUVSO ʜ any() return null and cause runtime error GVO
   MFOHUI UFYU4USJOH
   
   *OU
   \
   ʜ
   ^ Non-Null
9. Yes kmockito!
10. Using features of Kotlin top-level extensions inline and reified Extension Properties Destructuring Declarations
11. top-level extensions
12. τοϓϨϕϧʹؔ਺͕ॻ͚ͯศར
13. TUBUJDϝιου܈Λ࣋ͭΫϥε͕ੜ੒͞ΕΔ ֦ுؔ਺܈͸XX_extension.ktʹूΊΔͱΑͦ͞͏
14. lnline & reified
15. ৑௕ͳܕͷهड़Λ΍ΊΔ WBM
    JUFN
    
    NPDL *UFNDMBTTKBWB WBM
    JUFN
    *UFN
    
    NPDL
    JUFNMFOHUI NPDL
16. ৑௕ͳܕͷهड़Λ΍ΊΔ GVO
    5
    
    "OZ
    NPDL
    
    .PDLJUPNPDL 5DMBTTKBWB
17. ৑௕ͳܕͷهड़Λ΍ΊΔ GVO
    5
    
    "OZ
    NPDL
    
    .PDLJUPNPDL 5DMBTTKBWB ܕফڈʹΑͬͯΤϥʔ
18. ৑௕ͳܕͷهड़Λ΍ΊΔ GVO
    5
    
    "OZ
    NPDL
    
    .PDLJUPNPDL 5DMBTTKBWB ܕফڈʹΑͬͯΤϥʔ JOMJOF
    GVO
    SFJpFE
    5
    
    "OZ
    NPDL
    
    .PDLJUPNPDL 5DMBTTKBWB
19. ৑௕ͳܕͷهड़Λ΍ΊΔ GVO
    5
    
    "OZ
    NPDL
    
    .PDLJUPNPDL 5DMBTTKBWB ܕফڈʹΑͬͯΤϥʔ JOMJOF
    GVO
    SFJpFE
    5
    
    "OZ
    NPDL
    
    .PDLJUPNPDL 5DMBTTKBWB JOMJOFԽͯ͠ܕύϥϝʔλʹSFJpFEΛ෇༩͢Δͱ5Λ۩৅ܕͱ͔ͯ͋ͭ͑͠Δ ˞LPUMJOSFqFDU͕ඞཁͰ͢
20. ৑௕ͳܕͷهड़Λ΍ΊΔ JOMJOF
    GVO
    SFJpFE
    5
    
    "OZ
    NPDL
    
    .PDLJUPNPDL 5DMBTTKBWB WBM
    JUFN
    *UFN
    
    NPDL
    JUFNMFOHUI NPDL :FT
21. Extension Properties
22. ৑௕ͳϝιουݺͼग़͠Λ΍ΊΔ GVO
    5
    5JOWPLFE
    
    .PDLJUPAXIFOA UIJT JUFNMFOHUI JOWPLFE UIFO3FUVSO 
23. ৑௕ͳϝιουݺͼग़͠Λ΍ΊΔ GVO
    5
    5JOWPLFE
    
    .PDLJUPAXIFOA UIJT JUFNMFOHUI JOWPLFE UIFO3FUVSO  ͳͯ͘΋Α͘ͳ͍ʁ
24. ৑௕ͳϝιουݺͼग़͠Λ΍ΊΔ GVO
    5
    5JOWPLFE
    
    .PDLJUPAXIFOA UIJT
    WBM
    5
    5JOWPLFE
    0OHPJOH4UVCCJOH5
    
    
    
    
    HFU
    
    JOWPLFE ɾ&YUFOTJPO
    1SPQFSUJFTͰ೚ҙͷΫϥεʹϓϩύςΟΛ෇༩͢Δ
    ɾϓϩύςΟΞΫηε࣌ʹϝιουݺͼग़͠
25. ৑௕ͳϝιουݺͼग़͠Λ΍ΊΔ GVO
    5
    5JOWPLFE
    
    .PDLJUPAXIFOA UIJT
    WBM
    5
    5JOWPLFE
    0OHPJOH4UVCCJOH5
    
    
    
    
    HFU
    
    JOWPLFE ɾ&YUFOTJPO
    1SPQFSUJFTͰ೚ҙͷΫϥεʹϓϩύςΟΛ෇༩͢Δ
    ɾϓϩύςΟΞΫηε࣌ʹϝιουݺͼग़͠ JUFNMFOHUI JOWPLFEUIFO3FUVSO 
26. Destructuring Declarations
27. 85' JUFNTPNF.FUIPE BOZ*OU
    BOZ4USJOH
    BOZ
    BOZ
    
    
    
    
    JOWPLFE
    
    
    
    
    UIFO"OTXFS
    \
    
    
    
    
    
    
    WBM
    B
    
    JUBSHVNFOUT<>
    BT
    *OU
    
    
    
    
    
    
    WBM
    C
    
    JUBSHVNFOUT<>
    BT
    4USJOH
    
    
    
    
    
    
    WBM
    D
    
    JUBSHVNFOUT<>
    BT
    *UFN
    
    
    
    
    
    
    WBM
    E
    
    JUBSHVNFOUT<>
    BT
    /BNF
    
    
    
    
    
    
    
    EP
    TPNFUIJOH
    
    
    
    
    ^
28. %FTUSVDUVSJOH
    %FDMBSBUJPOT
    Λ࢖ͬͨ୅ೖ WBM
    B
    C
    
    1BJS l)FMMPz
    
    B
    
    l)FMMPz
    C
    
    
29. %FTUSVDUVSJOH
    %FDMBSBUJPOT
    Λ࢖ͬͨ୅ೖ WBM
    B
    C
    
    1BJS l)FMMPz
    
    B
    
    l)FMMPz
    C
    
     ಛఆͷϧʔϧʹԊͬͨΫϥεͰ
    %FTUSVDUVSJOH
    %FDMBSBUJPOT͕࢖͑Δɻ
30. %FTUSVDUVSJOH
    %FDMBSBUJPOTͷϧʔϧ DMBTT
    'PP
    \
    
    
    PQFSBUPS
    GVO
    DPNQPOFOU 
    4USJOH
    
    ʜ
    
    
    PQFSBUPS
    
    GVO
    DPNQPOFOU 
    *OU
    
    ʜ
    
    
    PQFSBUPS
    GVO
    DPNQPOFOU/ 
    5
    
    ʜ
    ^ GVO
    EP4PNFUIJOH GPP
    'PP
    \
    
    
    WBM
    B
    C
    
    GPP
    
    
    ʜ
    ^ DPNQPOFOU/ ͱ͍͏ϝιουΛඞཁͳ਺͚ͩ࣋ͭ
31. %BUB
    $MBTTͰએݴָʑ EBUB
    DMBTT
    'PP WBM
    B4USJOH
    WBM
    C*OU GVO
    EP4PNFUIJOH GPP
    'PP
    \
    
    
    WBM
    B
    C
    
    GPP
    
    
    ʜ
    ^ %BUB
    $MBTTͰলུՄೳ
32. *OWPDBUJPO0O.PDLʹϝιουΛ௥Ճ JOMJOF
    GVO
    SFJpFE
    "
    SFJpFE
    #
    SFJpFE
    $
    *OWPDBUJPO0O.PDLBSHVNFOUT
    
    
    5SJQMF BSHVNFOUT<>
    BT
    "
    BSHVNFOUT<>
    BT
    #
    BSHVNFOUT<>
    BT
    $
33. *OWPDBUJPO0O.PDLʹϝιουΛ௥Ճ JOMJOF
    GVO
    SFJpFE
    "
    SFJpFE
    #
    SFJpFE
    $
    *OWPDBUJPO0O.PDLBSHVNFOUT
    
    
    5SJQMF BSHVNFOUT<>
    BT
    "
    BSHVNFOUT<>
    BT
    #
    BSHVNFOUT<>
    BT
    $ JUFNTPNF.FUIPE BOZ*OU
    BOZ4USJOH
    BOZ
    
    
    
    
    JOWPLFE
    
    
    
    
    UIFO"OTXFS
    \
    
    
    
    
    
    
    WBM
    B
    C
    D
    
    JUBSHVNFOUT*OU
    4USJOH
    *UFN
    
    
    
    
    
    
    
    EP
    TPNFUIJOH
    
    
    
    
    ^ :FT
34. Conclusion
35. ,PUMJOֶशͱϥΠϒϥϦ࡞੒ ߦఔ౓Ͱ݁ߏ࢖͑Δ΋ͷ͕࡞ΕΔ
    ϥΠϒϥϦͩͱ"OESPJEͳͲͷϑϨʔϜϫʔΫ ʹ͋·ΓറΒΕͣॻ͚ΔͷͰֶश͕͸͔ͲΔ
    େମίʔυ͕ճ͘Β͍ม਎͢ΔɻͦͷதͰ,PUMJO ͷ࢓༷΍ػೳ΍ॻ͖ํͳͲʹ͍ͭͯ৭ʑͱ۷ΕΔ
    ࠷ѱࣺͯΒΕΔ
36. Let’s Enjoy Kotlin life ϥΠϒϥϦΛ࡞ͬͯ
37. ͓·͚
38. ಉ͡Α͏ͳϥΠϒϥϦཚཱ໰୊ ͏ʔΜͲ͏ͨ͠΋ͷ͔
39. "XFTPNFLPUMJO ͜͜ʹೖΓ͍ͨ໰୊ https://github.com/JavaBy/awesome-kotlin
40. ؤுΖ͏