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 LJVDIJ
   LFJTVLF
   
   4IJCVZBBQL
2. ໦಺
   ܒี w ৬ۀɿ:
   ͷ"OESPJEΤϯδχΞ
   ݉
   ҭࣇύύ
   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
3. ࠷ۙͷΞΫςΟϏςΟ
4. ࠓճͷൃද͸
   كʹΑ͋͘Δ໰୊Λ
   ׂͱΑ͋͘Δख๏Ͱղܾ͠Α͏ͥ
   ͱ͍͏γϯϓϧͳ࿩
5. ΞδΣϯμ wҙຯͱ੍໿Λදݱ͠Α͏
   wແΛදݱ͠Α͏
   wϨϏϡʔ؍఺ΛγΣΞ͠Α͏
6. ҙຯͱ੍໿Λදݱ͠Α͏
7. ಥવͰ͕࣭͢໰Ͱ͢
   WBM
   QIPOF/VN4USJOH
   ͱ͍͏ม਺ΛݟͨΒͲΜͳ஋Λ
 ૝૾͠·͔͢ʁ
8. ࣍ͷ࣭໰
   WBM
   UFMFQIPOF/VN4USJOH
   ͳΒͲ͏͍͏஋Ͱ͠ΐ͏
10. ࣅͯΔ͚ͲผͷҙຯΛ࣋ͭม਺ w QIPOF/VN
    
    l9999::::
    w UFMFQIPOF/VN
    
    lUFM9999::::z ʮΒ͘ͰΜʯͷΞϓϦΑΓҰ෦վѱͯ͠ൈਮ
11. EBUBΫϥε JOJUؔ਺Ͱ
 ҙຯͱ੍໿Λදݱ͠Α͏
12. UFMFQIPOF/VNCFS
    JT
     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$)&.&͔Β
 ࢝·ͬͯΔ͜ͱ ಛఆͷਖ਼نදݱΛ
 ຬͨ͢͜ͱ
13. QIPOF/VNCFS
    JT class PhoneNumber(val number: String) { init { if (number.startsWith(TelephoneNumber.SCHEME)) { throw IllegalArgumentException(“error") } else if ((number.contains(Regex(".*[^0-9#¥+¥*() -]+.*")))) { throw IllegalArgumentException(“error") } } } 4$)&.&͔Β࢝·ͬͯ
 ͍ͳ͍͜ͱ ಛఆͷਖ਼نදݱΛ
 ຬͨ͢͜ͱ
14. ิ଍JOMJOF$MBTT
    PS
    EBUB$MBTT w *OMJOF
    DMBTT ,PUMJO
    WFSd
    w JOJUϝιουΛ࣋ͯͳ͍ͷͰɺܕ੍໿ͷΈͰे෼ͷ৔߹ ʹར༻
    w EBUB
    DMBTT
    w JOJUϝιουΛ࣋ͯΔͰɺܕ੍໿ ϩδΧϧͳ੍໿Λ΋ ͍ͨͤͨ৔߹ʹར༻ ˞͋͘·Ͱ๻ݸਓͷߟ͑ํͰ͢
15. ແΛදݱ͠Α͏
16. ࣍ͷ໰୊
    ͋Δ-JTU͔Β৚݅ʹ߹கͨ͠
 ཁૉΛऔΓग़ؔ͢਺Λ࡞Γ͍ͨ
17. val contactList = List<Contact>() fun findSameNumberContact(phoneNumber: PhoneNumber):Contact? { return contactList.find { it.getPhoneNumber() == phoneNumber } } ۭͷ-JTU͚ͩͲΩχγφΠσ
18. ͍͍Ͷʂ☺
19. val contactList = List<Contact>() fun findSameNumberContact(phoneNumber: PhoneNumber):Contact? { return contactList.find { it.getPhoneNumber() == phoneNumber } } Μʁ
20. /VMMBCMFͩ
21. ແΛදݱ͠Α͏
22. val contactList = List<Contact>() 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
23. /PO/VMMͰແΛදݱʂ ☺ ˞ͨͩ͠ɺ/VMMͷ··ʹͨ͠΄͏͕ྑ͍৔߹΋͋ΔͷͰ༻๏༻ྔΛकͬͯ࢖͍·͠ΐ͏
24. ิ଍/VMMBCMF
    PS
    ແΛදݱ 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
25. ϨϏϡʔ؍఺ΛγΣΞ͠Α͏
26. ๭೔ɺ͋Δ13ΛϨϏϡʔ ͍ͯͨ࣌͠ͷ͜ͱ
27. ࢦఠͨ͠΄͏͕͍͍
 Օॴ͕ଟ͗͢Δ
28. ࢦఠ͠ͳ͍Θ͚ʹ΋͍͔ͳ͍͕ɺ શ෦ࢦఠ͢Δͷ΋͠ΜͲ͍
29. ͳͷͰɺָΛͭͭ͠
    νʔϜٕज़ྗͷ޲্ʹܨ͕Δํ๏ Λ΍ͬͯΈͨ
30. ձٞࣨΛ઎ڌͯ͠
 ϞϒϓϩతϨϏϡʔձΛ࣮ࢪ
31. ϞϒϓϩతϨϏϡʔ w ࢀՃऀɿ"OESPJE
    &OHਓɺJ04
    &OHਓ
    w ୊ࡐɿྫͷ13 ,PUMJO
    w ΍ͬͨ͜ͱɿ
 ࢦఠՕॴΛͲΜͲΜϗϫΠτϘʔυʹॻ͖ग़͢
 Ͳ͏௚ͨ͠΄͏͕͍͍͔ɺΛٞ࿦͢Δ
 ࢦఠΛ൓ө ͔͚ͨͬͨ͠Ͳ࣌ؒͷ౎߹্࣮ݱͤͣ
32. ϞϒϓϩతϨϏϡʔ ˞ࣾ֎ൿͳͷͰϞβΠΫॲཧͯ͠·͢
33. ΍ͬͯΈͨײ৮ w վΊͯݟͯΈΔͱʮ͜ͷ࣮૷ԿΛҙਤͯ͠ΔΜͩ ʯͬͯͷ͕
 ग़ͯ͘Δ
    w ࢦఠ͞ΕΕ͹౰ͨΓલͱࢥ͑Δ΋ͷ͕ଟ͍
    w ม਺໊ؔ਺໊ͷ໋໊ͷେ੾͞Λ࠶ೝࣝͨ͠
    w ,PUMJOʹ׳Εͯͳ͍ਓ͕ॻ͘ͱ7BS͕ଟ͘ͳΔ
34. ϨϏϡʔ؍఺ΛγΣΞͯ͠ɺ
 νʔϜΈΜͳ͕ཧղͰ͖Δ
 ࣮૷Λ৺͕͚Α͏
35. ·ͱΊ wࣅͨҙຯΛ͚࣋ͭͲҟͳΔม਺
 ˠҙຯͱ੍໿Λදݱ͠Α͏
    wOVMMBCMFΛແ͘͢ํ๏
 ˠແΛදݱ͠Α͏
    wνʔϜͷٕज़ྗ޲্΋݉Ͷͯۮʹ͸
 ϨϏϡʔ؍఺ΛγΣΞ͠Α͏
36. ͓ΘΓͰͬ͢ʂ