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良いコードを書くためにやってみてること3つ.pdf
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Keisuke kiuchi
October 31, 2018
Programming
5
660
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/
Keisuke kiuchi
October 31, 2018
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Transcript
ྑ͍ίʔυΛॻͨ͘Ίʹ ͬͯΈͯΔ͜ͱͭ LJVDIJLFJTVLF 4IJCVZBBQL
ܒี w ৬ۀɿ:ͷ"OESPJEΤϯδχΞ݉ҭࣇύύ w झຯͰ࡞ͬͨϞϊɿʮΒ͘ͰΜ "QQ ʯɺ ʮ$MFBO"SDIJUFDUVSF5FNQMBUF'PS,PUMJO 044 ʯ
w Ϟοτʔɿ໌ͷࣗʹ༏͍͠ίʔυΛॻ͘ w 4/4 5XJUUFS!GFJ@LPNF (JUIVC!LJVDIJLFJTVLF 2JJUB!L@LFJTVLF
࠷ۙͷΞΫςΟϏςΟ
ࠓճͷൃද كʹΑ͋͘ΔΛ ׂͱΑ͋͘Δख๏Ͱղܾ͠Α͏ͥ ͱ͍͏γϯϓϧͳ
ΞδΣϯμ wҙຯͱ੍Λදݱ͠Α͏ wແΛදݱ͠Α͏ wϨϏϡʔ؍ΛγΣΞ͠Α͏
ҙຯͱ੍Λදݱ͠Α͏
ಥવͰ͕࣭͢Ͱ͢ WBMQIPOF/VN4USJOH ͱ͍͏มΛݟͨΒͲΜͳΛ ૾͠·͔͢ʁ
࣍ͷ࣭ WBMUFMFQIPOF/VN4USJOH ͳΒͲ͏͍͏Ͱ͠ΐ͏
None
ࣅͯΔ͚ͲผͷҙຯΛ࣋ͭม w QIPOF/VNl9999:::: w UFMFQIPOF/VNlUFM9999::::z ʮΒ͘ͰΜʯͷΞϓϦΑΓҰ෦վѱͯ͠ൈਮ
EBUBΫϥε JOJUؔͰ ҙຯͱ੍Λදݱ͠Α͏
UFMFQIPOF/VNCFSJT data class TelephoneNumber(val number: String) { init { if
(!number.startsWith(SCHEME)) { throw IllegalArgumentException(“error“) } else if (number.substring(SCHEME.length) .contains(Regex(“.*[^0-9#¥+¥*() -]+.*"))) { throw IllegalArgumentException(“error”) } } companion object { const val SCHEME = "tel:" } } 4$)&.&͔Β ࢝·ͬͯΔ͜ͱ ಛఆͷਖ਼نදݱΛ ຬͨ͢͜ͱ
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$)&.&͔Β࢝·ͬͯ ͍ͳ͍͜ͱ ಛఆͷਖ਼نදݱΛ ຬͨ͢͜ͱ
ิJOMJOF$MBTT PSEBUB$MBTT w *OMJOFDMBTT ,PUMJOWFSd w JOJUϝιουΛ࣋ͯͳ͍ͷͰɺܕ੍ͷΈͰेͷ߹ ʹར༻ w
EBUBDMBTT w JOJUϝιουΛ࣋ͯΔͰɺܕ੍ ϩδΧϧͳ੍Λ ͍ͨͤͨ߹ʹར༻ ˞͋͘·Ͱݸਓͷߟ͑ํͰ͢
ແΛදݱ͠Α͏
࣍ͷ ͋Δ-JTU͔Β݅ʹ߹கͨ͠ ཁૉΛऔΓग़ؔ͢Λ࡞Γ͍ͨ
val contactList = List<Contact>() fun findSameNumberContact(phoneNumber: PhoneNumber):Contact? { return contactList.find
{ it.getPhoneNumber() == phoneNumber } } ۭͷ-JTU͚ͩͲΩχγφΠσ
͍͍Ͷʂ☺
val contactList = List<Contact>() fun findSameNumberContact(phoneNumber: PhoneNumber):Contact? { return contactList.find
{ it.getPhoneNumber() == phoneNumber } } Μʁ
/VMMBCMFͩ
ແΛදݱ͠Α͏
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
/PO/VMMͰແΛදݱʂ ☺ ˞ͨͩ͠ɺ/VMMͷ··ʹͨ͠΄͏͕ྑ͍߹͋ΔͷͰ༻๏༻ྔΛक͍ͬͯ·͠ΐ͏
ิ/VMMBCMF PSແΛදݱ w ແΛදݱˠ/VMMʹͳΔ͜ͱ͕ਖ਼ৗܥͷൣғͷ߹ྫ֎ॲཧ͕ෆ ཁʹͳΔ߹ w ྫ&EJU5FYUʹϢʔβʔ͕ೖྗͨ͠ి൪߸ʹϚον͢Δి൪߸Λ pOEͰݟ͚ͭɺి൪߸Λදࣔ͢Δ ݟ͔ͭΒͳ͍ͳΒۭจࣈ
w /VMMͷ··ˠ/VMMʹͳΔ͜ͱ͕ຊདྷ͋Γ͑ͳ͍߹ w ྫిாҰཡͰνΣοΫΛೖΕͨ൪߸͚ͩΛpOEͰݟ͚ͭΔ ˞͋͘·Ͱݸਓͷߟ͑ํͰ͢
ϨϏϡʔ؍ΛγΣΞ͠Α͏
ɺ͋Δ13ΛϨϏϡʔ ͍ͯͨ࣌͠ͷ͜ͱ
ࢦఠͨ͠΄͏͕͍͍ Օॴ͕ଟ͗͢Δ
ࢦఠ͠ͳ͍Θ͚ʹ͍͔ͳ͍͕ɺ શ෦ࢦఠ͢Δͷ͠ΜͲ͍
ͳͷͰɺָΛͭͭ͠ νʔϜٕज़ྗͷ্ʹܨ͕Δํ๏ ΛͬͯΈͨ
ձٞࣨΛڌͯ͠ ϞϒϓϩతϨϏϡʔձΛ࣮ࢪ
ϞϒϓϩతϨϏϡʔ w ࢀՃऀɿ"OESPJE&OHਓɺJ04&OHਓ w ࡐɿྫͷ13 ,PUMJO w ͬͨ͜ͱɿ ࢦఠՕॴΛͲΜͲΜϗϫΠτϘʔυʹॻ͖ग़͢
Ͳ͏ͨ͠΄͏͕͍͍͔ɺΛٞ͢Δ ࢦఠΛө ͔͚ͨͬͨ͠Ͳ࣌ؒͷ߹্࣮ݱͤͣ
ϞϒϓϩతϨϏϡʔ ˞ࣾ֎ൿͳͷͰϞβΠΫॲཧͯ͠·͢
ͬͯΈͨײ৮ w վΊͯݟͯΈΔͱʮ͜ͷ࣮ԿΛҙਤͯ͠ΔΜͩ ʯͬͯͷ͕ ग़ͯ͘Δ w ࢦఠ͞ΕΕͨΓલͱࢥ͑Δͷ͕ଟ͍ w ม໊໊ؔͷ໋໊ͷେ͞Λ࠶ೝࣝͨ͠ w
,PUMJOʹ׳Εͯͳ͍ਓ͕ॻ͘ͱ7BS͕ଟ͘ͳΔ
ϨϏϡʔ؍ΛγΣΞͯ͠ɺ νʔϜΈΜͳ͕ཧղͰ͖Δ ࣮Λ৺͕͚Α͏
·ͱΊ wࣅͨҙຯΛ͚࣋ͭͲҟͳΔม ˠҙຯͱ੍Λදݱ͠Α͏ wOVMMBCMFΛແ͘͢ํ๏ ˠແΛදݱ͠Α͏ wνʔϜͷٕज़ྗ্݉Ͷͯۮʹ ϨϏϡʔ؍ΛγΣΞ͠Α͏
͓ΘΓͰͬ͢ʂ