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Optional(2018)年...その後
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Hideaki Tamai
July 26, 2018
Technology
3
1.1k
Optional(2018)年...その後
Hideaki Tamai
July 26, 2018
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Transcript
0QUJPOBM ͦͷޙ )JEFBLJ5BNBJ 1PUBUPUJQT+VMZ
ࣗݾհ )JEFBLJ5BNBJ ɾ.POFZ'PSXBSE *OD ɾJ04ΞϓϦΤϯδχΞ ɾ͘͘͢͢ʂࢠҭͯΤϯδχΞ.FFUVQ UBNBEPO !UBNBEPO
IUUQTNPOFZGPSXBSEDPNFOHJOFFST@CMPHPQUJPOBM 0QUJPOBM ͚͋·͓ͯ͠ΊͰͱ͏͍͟͝·͢
͜ΕΛػʹXBSOJOHΛ໓͘͢ ࣾJ04ΤϯδχΞ͕ ෦ॺΛӽ͑ͯऔΓΈ·ͨ͠ ௨ৗͷػೳ։ൃͱฒߦͯ͠ϲ݄
Before
ͬͨ͜ͱͦͷ̍ 4XJGU-JOU "VUPDPSSFDU
Πϯσϯτͷௐ͚͔ͩͱࢥͬͯͨΒɺ ؆୯ͳwarningमਖ਼ͯ͘͠Εͨ func validate(_ input :(hoge: Fuga)) throws -> Void
{ func validate(_ input :(hoge: Fuga)) throws {
None
ͬͨ͜ͱͦͷ̎ γϡοͱͤͦ͏ͳXBSOJOHΛফ͢
- public final class Hoge: Fuga { + public class
Hoge: Fuga { - network.request(request) { _ in } + _ = network.request(request) { _ in } ྫʣ͜͏͍͏ͭ
None
͋ͱͪͪ͘͘ಓʹ XBSOJOHΛͭͿ͍ͯͬͨ͠
ਏ͔ͬͨͭ
Ұ෦ͷϥΠϒϥϦ͕$PDPB1PET ܦ༝͡Όͳ͍ํ๏Ͱಋೖͯ͋͠Δ ʢେ$PDPB1PETܦ༝ʣ wͲͷόʔδϣϯΛͬͯΔ͔͔Βͳ͍ͷͰ࠷৽ʹΞο ϓσʔτͨ࣌͠ͷӨڹൣғ͕ݟ͑ͣɺΞοϓσʔτ͠ ͯྑ͍ͷ͔ෆ໌ w͔͠Ұ෦ಠ࣮ࣗΛՃͯͬͯ͠Δͭ͋Δ
ಠ࣮ࣗΛՃͯ͠ͳ͍ ϥΠϒϥϦ wϥΠϒϥϦͷόʔδϣϯΛίϛοτϩά͔Βਪଌ ͠ӨڹൣғΛௐࠪ w$PDPB1PETʹҠߦ
ಠ࣮ࣗΛՃͯ͠Δ ϥΠϒϥϦ w൚༻తͳػೳՃͩͬͨͷͰɺϥΠϒϥϦΛGPSL͠ ͯຊՈʹQVMMSFRVFTUΛग़ͨ͠ wऔΓࠐ·Εͳ͔ͬͨϥΠϒϥϦGPSLFESFQPTJUPSZ ͷϥΠϒϥϦΛ$PDPB1PETͰΠϯετʔϧ
After
Before
After Ϗϧυʹ͔͔Δ͕࣌ؒϝνϟॖ͞Εͨ XBSOJOHআ͚ͩͰͳ͘ɺ4XJGUରԠ ίϯύΠϧΦϓγϣϯͷมߋޮՌ͕͋ͬͨͱࢥΘΕΔ
࠷ޙͷXBSOJOH ՝ۚͷϨγʔτ͕J04ܗࣜ ˠݱࡏରԠத
XBSOJOHΛ૿͞ͳ͍ औΓΈ
Ұྫ ɾϏϧυ࣌ʹ4XJGU-JOU"VUPDPSSFDU࣮ߦ ɾϏϧυʹNTҎ্͔͔͍ͬͯΔॲཧͰXBSOJOH ɾ4JEFSʢNJTTQFMMʣಋೖ ɾ%BOHFSಋೖ
·ͱΊ w ݹ͔͘Βӡ༻͞Ε͍ͯΔϓϩμΫτͰؤுͬͯऔΓΊɺXBSOJOHΛ ΄΅̌ʹग़དྷΔ w ϏϧυॖͷऔΓΈग़དྷͯϏϧυ͕࣌ؒ·Ͱॖग़དྷͨ w ෦ॺΛ·͍ͨͰXBSOJOH໓ʹऔΓΜͩͷͰɺࣾͷJ04ΤϯδχΞͰ XBSOJOHϦϑΝΫλϦϯάʹର͢Δҙ͕ࣝߴ·ͬͨ w
XBSOJOHΛݮΒͯ͠ຬ͢ΔͷͰͳ͘ɺ૿͞ͳ͍Έͷߏங͕େࣄ
͝ਗ਼ௌ͋Γ͕ͱ͏͟͝ ͍·ͨ͠