良いコードを書くためにやってみてること3つ.pdf

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ྑ͍ίʔυΛॻͨ͘Ίʹ ΍ͬͯΈͯΔ͜ͱͭ LJVDIJLFJTVLF 4IJCVZBBQL

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໦಺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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࠷ۙͷΞΫςΟϏςΟ

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ࠓճͷൃද͸ كʹΑ͋͘Δ໰୊Λ ׂͱΑ͋͘Δख๏Ͱղܾ͠Α͏ͥ ͱ͍͏γϯϓϧͳ࿩

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ΞδΣϯμ wҙຯͱ੍໿Λදݱ͠Α͏ wແΛදݱ͠Α͏ wϨϏϡʔ؍఺ΛγΣΞ͠Α͏

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ҙຯͱ੍໿Λදݱ͠Α͏

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ಥવͰ͕࣭͢໰Ͱ͢ WBMQIPOF/VN4USJOH ͱ͍͏ม਺ΛݟͨΒͲΜͳ஋Λ  ૝૾͠·͔͢ʁ

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࣍ͷ࣭໰ WBMUFMFQIPOF/VN4USJOH ͳΒͲ͏͍͏஋Ͱ͠ΐ͏

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No content

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

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EBUBΫϥεJOJUؔ਺Ͱ  ҙຯͱ੍໿Λදݱ͠Α͏

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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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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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ิ଍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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ແΛදݱ͠Α͏

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࣍ͷ໰୊ ͋Δ-JTU͔Β৚݅ʹ߹கͨ͠  ཁૉΛऔΓग़ؔ͢਺Λ࡞Γ͍ͨ

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

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͍͍Ͷʂ☺

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

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/VMMBCMFͩ

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ແΛදݱ͠Α͏

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

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ิ଍/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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ϨϏϡʔ؍఺ΛγΣΞ͠Α͏

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๭೔ɺ͋Δ13ΛϨϏϡʔ ͍ͯͨ࣌͠ͷ͜ͱ

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ࢦఠͨ͠΄͏͕͍͍  Օॴ͕ଟ͗͢Δ

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ࢦఠ͠ͳ͍Θ͚ʹ΋͍͔ͳ͍͕ɺ શ෦ࢦఠ͢Δͷ΋͠ΜͲ͍

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ͳͷͰɺָΛͭͭ͠ νʔϜٕज़ྗͷ޲্ʹܨ͕Δํ๏ Λ΍ͬͯΈͨ

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ձٞࣨΛ઎ڌͯ͠  ϞϒϓϩతϨϏϡʔձΛ࣮ࢪ

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ϞϒϓϩతϨϏϡʔ w ࢀՃऀɿ"OESPJE&OHਓɺJ04&OHਓ w ୊ࡐɿྫͷ13 ,PUMJO w ΍ͬͨ͜ͱɿ  ࢦఠՕॴΛͲΜͲΜϗϫΠτϘʔυʹॻ͖ग़͢  Ͳ͏௚ͨ͠΄͏͕͍͍͔ɺΛٞ࿦͢Δ  ࢦఠΛ൓ө ͔͚ͨͬͨ͠Ͳ࣌ؒͷ౎߹্࣮ݱͤͣ

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ϞϒϓϩతϨϏϡʔ ˞ࣾ֎ൿͳͷͰϞβΠΫॲཧͯ͠·͢

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΍ͬͯΈͨײ৮ w վΊͯݟͯΈΔͱʮ͜ͷ࣮૷ԿΛҙਤͯ͠ΔΜͩ ʯͬͯͷ͕  ग़ͯ͘Δ w ࢦఠ͞ΕΕ͹౰ͨΓલͱࢥ͑Δ΋ͷ͕ଟ͍ w ม਺໊ؔ਺໊ͷ໋໊ͷେ੾͞Λ࠶ೝࣝͨ͠ w ,PUMJOʹ׳Εͯͳ͍ਓ͕ॻ͘ͱ7BS͕ଟ͘ͳΔ

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ϨϏϡʔ؍఺ΛγΣΞͯ͠ɺ  νʔϜΈΜͳ͕ཧղͰ͖Δ  ࣮૷Λ৺͕͚Α͏

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·ͱΊ wࣅͨҙຯΛ͚࣋ͭͲҟͳΔม਺  ˠҙຯͱ੍໿Λදݱ͠Α͏ wOVMMBCMFΛແ͘͢ํ๏  ˠແΛදݱ͠Α͏ wνʔϜͷٕज़ྗ޲্΋݉Ͷͯۮʹ͸  ϨϏϡʔ؍఺ΛγΣΞ͠Α͏

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͓ΘΓͰͬ͢ʂ