良いコードを書くためにやってみてること3つ.pdf

shibuya.apk#29
https://shibuya-apk.connpass.com/event/104424/

Transcript

1. ྑ͍ίʔυΛॻͨ͘Ίʹ
   ΍ͬͯΈͯΔ͜ͱͭ
   LJVDIJLFJTVLF
   4IJCVZBBQL
   

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2. ໦಺ܒี
   w ৬ۀɿ:ͷ"OESPJEΤϯδχΞ݉ҭࣇύύ
   w झຯͰ࡞ͬͨϞϊɿʮΒ͘ͰΜ "QQ
   ʯɺ

   ʮ$MFBO"SDIJUFDUVSF5FNQMBUF'PS,PUMJO 044
   ʯ
   w Ϟοτʔɿ໌೔ͷࣗ෼ʹ༏͍͠ίʔυΛॻ͘
   w 4/4

   5XJUUFS!GFJ@LPNF

   (JUIVC!LJVDIJLFJTVLF

   2JJUB!L@LFJTVLF
   

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3. ࠷ۙͷΞΫςΟϏςΟ
   
   

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4. ࠓճͷൃද͸
   كʹΑ͋͘Δ໰୊Λ
   ׂͱΑ͋͘Δख๏Ͱղܾ͠Α͏ͥ
   ͱ͍͏γϯϓϧͳ࿩
   

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5. ΞδΣϯμ
   wҙຯͱ੍໿Λදݱ͠Α͏
   wແΛදݱ͠Α͏
   wϨϏϡʔ؍఺ΛγΣΞ͠Α͏
   

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6. ҙຯͱ੍໿Λදݱ͠Α͏
   

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7. ಥવͰ͕࣭͢໰Ͱ͢
   WBMQIPOF/VN4USJOH
   ͱ͍͏ม਺ΛݟͨΒͲΜͳ஋Λ

   ૝૾͠·͔͢ʁ
   

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8. ࣍ͷ࣭໰
   WBMUFMFQIPOF/VN4USJOH
   ͳΒͲ͏͍͏஋Ͱ͠ΐ͏
   

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10. ࣅͯΔ͚ͲผͷҙຯΛ࣋ͭม਺
    w QIPOF/VNl9999::::
    w UFMFQIPOF/VNlUFM9999::::z
    ʮΒ͘ͰΜʯͷΞϓϦΑΓҰ෦վѱͯ͠ൈਮ
    

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11. EBUBΫϥεJOJUؔ਺Ͱ

    ҙຯͱ੍໿Λදݱ͠Α͏
    

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12. UFMFQIPOF/VNCFSJT
    data class TelephoneNumber(val number: String) {
    init {
    if (!number.startsWith(SCHEME)) {
    throw IllegalArgumentException(“error“)
    } else if (number.substring(SCHEME.length)
    .contains(Regex(“.*[^0-9#¥+¥*() -]+.*"))) {
    throw IllegalArgumentException(“error”)
    }
    }
    companion object {
    const val SCHEME = "tel:"
    }
    }
    4$)&.&͔Β

    ࢝·ͬͯΔ͜ͱ
    ಛఆͷਖ਼نදݱΛ

    ຬͨ͢͜ͱ
    

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13. QIPOF/VNCFSJT
    class PhoneNumber(val number: String) {
    init {
    if (number.startsWith(TelephoneNumber.SCHEME)) {
    throw IllegalArgumentException(“error")
    } else if ((number.contains(Regex(".*[^0-9#¥+¥*() -]+.*")))) {
    throw IllegalArgumentException(“error")
    }
    }
    }
    4$)&.&͔Β࢝·ͬͯ

    ͍ͳ͍͜ͱ
    ಛఆͷਖ਼نදݱΛ

    ຬͨ͢͜ͱ
    

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14. ิ଍JOMJOF$MBTT PSEBUB$MBTT
    w *OMJOFDMBTT ,PUMJOWFSd
    
    w JOJUϝιουΛ࣋ͯͳ͍ͷͰɺܕ੍໿ͷΈͰे෼ͷ৔߹
    ʹར༻
    w EBUBDMBTT
    w JOJUϝιουΛ࣋ͯΔͰɺܕ੍໿ϩδΧϧͳ੍໿Λ΋
    ͍ͨͤͨ৔߹ʹར༻
    ˞͋͘·Ͱ๻ݸਓͷߟ͑ํͰ͢
    

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15. ແΛදݱ͠Α͏
    

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16. ࣍ͷ໰୊
    ͋Δ-JTU͔Β৚݅ʹ߹கͨ͠

    ཁૉΛऔΓग़ؔ͢਺Λ࡞Γ͍ͨ
    

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17. val contactList = List()
    fun findSameNumberContact(phoneNumber: PhoneNumber):Contact? {
    return contactList.find { it.getPhoneNumber() == phoneNumber }
    }
    ۭͷ-JTU͚ͩͲΩχγφΠσ
    

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18. ͍͍Ͷʂ☺
    

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19. val contactList = List()
    fun findSameNumberContact(phoneNumber: PhoneNumber):Contact? {
    return contactList.find { it.getPhoneNumber() == phoneNumber }
    }
    Μʁ
    

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20. /VMMBCMFͩ
    

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21. ແΛදݱ͠Α͏
    

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22. val contactList = List()
    fun findSameNumberContact(phoneNumber: PhoneNumber):Contact {
    return contactList.find { it.phoneNumber == phoneNumber } ?:
    Contact.NONE
    }
    data class Contact(val displayName: String, val contactId: String, val
    phoneNumber: PhoneNumber) {
    companion object {
    val NONE = Contact("", "", PhoneNumber(""))
    }
    }
    dddddddddddddddddddddddddddddddddddddddddddddddddddd
    

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23. /PO/VMMͰແΛදݱʂ
    ☺
    ˞ͨͩ͠ɺ/VMMͷ··ʹͨ͠΄͏͕ྑ͍৔߹΋͋ΔͷͰ༻๏༻ྔΛकͬͯ࢖͍·͠ΐ͏
    

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24. ิ଍/VMMBCMF PSແΛදݱ
    w ແΛදݱˠ/VMMʹͳΔ͜ͱ͕ਖ਼ৗܥͷൣғ಺ͷ৔߹ྫ֎ॲཧ͕ෆ
    ཁʹͳΔ৔߹
    w ྫ&EJU5FYUʹϢʔβʔ͕ೖྗͨ͠ి࿩൪߸ʹϚον͢Δి࿩൪߸Λ
    pOEͰݟ͚ͭɺి࿩൪߸Λදࣔ͢Δ ݟ͔ͭΒͳ͍ͳΒۭจࣈ
    
    w /VMMͷ··ˠ/VMMʹͳΔ͜ͱ͕ຊདྷ͋Γ͑ͳ͍৔߹
    w ྫి࿩ாҰཡͰνΣοΫΛೖΕͨ൪߸͚ͩΛpOEͰݟ͚ͭΔ
    ˞͋͘·Ͱ๻ݸਓͷߟ͑ํͰ͢
    

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25. ϨϏϡʔ؍఺ΛγΣΞ͠Α͏
    

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26. ๭೔ɺ͋Δ13ΛϨϏϡʔ
    ͍ͯͨ࣌͠ͷ͜ͱ
    

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27. ࢦఠͨ͠΄͏͕͍͍

    Օॴ͕ଟ͗͢Δ
    

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28. ࢦఠ͠ͳ͍Θ͚ʹ΋͍͔ͳ͍͕ɺ
    શ෦ࢦఠ͢Δͷ΋͠ΜͲ͍
    

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29. ͳͷͰɺָΛͭͭ͠
    νʔϜٕज़ྗͷ޲্ʹܨ͕Δํ๏
    Λ΍ͬͯΈͨ
    

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30. ձٞࣨΛ઎ڌͯ͠

    ϞϒϓϩతϨϏϡʔձΛ࣮ࢪ
    

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31. ϞϒϓϩతϨϏϡʔ
    w ࢀՃऀɿ"OESPJE&OHਓɺJ04&OHਓ
    w ୊ࡐɿྫͷ13 ,PUMJO
    
    w ΍ͬͨ͜ͱɿ

    ࢦఠՕॴΛͲΜͲΜϗϫΠτϘʔυʹॻ͖ग़͢

    Ͳ͏௚ͨ͠΄͏͕͍͍͔ɺΛٞ࿦͢Δ

    ࢦఠΛ൓ө ͔͚ͨͬͨ͠Ͳ࣌ؒͷ౎߹্࣮ݱͤͣ
    
    

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32. ϞϒϓϩతϨϏϡʔ
    ˞ࣾ֎ൿͳͷͰϞβΠΫॲཧͯ͠·͢
    

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33. ΍ͬͯΈͨײ৮
    w վΊͯݟͯΈΔͱʮ͜ͷ࣮૷ԿΛҙਤͯ͠ΔΜͩ ʯͬͯͷ͕

    ग़ͯ͘Δ
    w ࢦఠ͞ΕΕ͹౰ͨΓલͱࢥ͑Δ΋ͷ͕ଟ͍
    w ม਺໊ؔ਺໊ͷ໋໊ͷେ੾͞Λ࠶ೝࣝͨ͠
    w ,PUMJOʹ׳Εͯͳ͍ਓ͕ॻ͘ͱ7BS͕ଟ͘ͳΔ
    

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34. ϨϏϡʔ؍఺ΛγΣΞͯ͠ɺ

    νʔϜΈΜͳ͕ཧղͰ͖Δ

    ࣮૷Λ৺͕͚Α͏
    

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35. ·ͱΊ
    wࣅͨҙຯΛ͚࣋ͭͲҟͳΔม਺

    ˠҙຯͱ੍໿Λදݱ͠Α͏
    wOVMMBCMFΛແ͘͢ํ๏

    ˠແΛදݱ͠Α͏
    wνʔϜͷٕज़ྗ޲্΋݉Ͷͯۮʹ͸

    ϨϏϡʔ؍఺ΛγΣΞ͠Α͏
    

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36. ͓ΘΓͰͬ͢ʂ
    

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