あるインスタンスの取る値が 何パターンあるか数えてみるンゴ！

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1. !L@LPIFZJʢ5XJUUFSʣ
    ͋ΔΠϯελϯεͷऔΔ஋͕
   Կύλʔϯ͋Δ͔਺͑ͯΈΔϯΰʂ
2. ͸͡Ίʹ ͜ΜͳπΠʔτ͕ಥ೗λΠϜϥΠϯʹݱΕΔ IUUQTUXJUUFSDPNJOBNJZTUBUVT T
3. ͸͡Ίʹ ఴ෇͞Ε͍ͯΔιʔείʔυͷཁ໿ IUUQTUXJUUFSDPNJOBNJZTUBUVT T w 4IBSFE̍
   w TIBSFEΠϯελϯε͕ৗʹଘࡏ
   w TIBSFEΠϯελϯεͷґଘؔ܎͸Π ϯελϯεͷੜ੒ޙʹղܾ
   w 4IBSFE̎
   w TIBSFEΠϯελϯε͸ϥϯλΠϜ࣌ ʹੜ੒͞ΕΔ
   w ґଘؔ܎͸ΠχγϟϥΠβͰղܾ
4. ͸͡Ίʹ ࣗ෼ͷݟղ w γϯάϧτϯʹରͯ͠TIBSFEͱ͍͏໊લΛ෇͚Δ͜ͱ͸Ұൠత
   w (PPHMFͷTUZMF
   HVJEʹ΋هड़͞Ε͍ͯΔ<>
   w γϯάϧτϯ͸ʮ͋ΔΫϥεͷΠϯελϯε͕͔̍ͭ͠ͳ͍ʯ͜ͱΛ୲อ͢ Δઃܭ<>
   w 4IBSFE̎͸ΠϯελϯεΛෳ਺ݸ࡞ΕΔͨΊɺఆٛʹ൓͢Δ <>IUUQTHPPHMFHJUIVCJPTXJGU
   <>IUUQTKBXJLJQFEJBPSHXJLJ4JOHMFUPO@&&#'&#$&#
5. ͸͡Ίʹ ࣗ෼ͷݟղ w ݁࿦
   w 4IBSFE͕̍είͰ͢ʂ
   w ཧ༝
   w 4IBSFE̎ͷར༻ऀ͸ͦΕ͕γϯάϧτϯͰ͋Δ͜ͱΛظ଴͢Δ
   w ͔͠͠ɺ࣮૷্ͦ͏ͳ͍ͬͯͳ͍ͨΊɺೝࣝͷᴥᴪ͕ੜ͡Δ
   w ݁Ռతʹϓϩάϥϛϯάϛε͕ى͜Δ͜ͱΛݒ೦
6. ͸͡Ίʹ ग़୊ऀͷݟղ IUUQT[FOOEFWJOBNJZBSUJDMFTCFE ཁ໿͢Δͱ
   4IBSFE̍ͷํ͕ྑ͍
   ˞ൈਮՕॴҎ֎ʹ΋
   ཧ༝͕͋Γ·͢
7. ͸͡Ίʹ ௚࿨ɺ௚ੵܕͬͯͳΜͩʁʁ IUUQT[FOOEFWJOBNJZBSUJDMFTCFE ࿦ڌʹ͋Δ௚࿨ɾ௚ੵܕ
   ΛվΊͯௐ΂ͯΈΔ͜ͱʹ
8. ୅਺తσʔλܕ ఆٛ w ܕಉ࢜Λ૊Έ߹Θͤͯ࡞ΒΕΔܕͰ௚ੵܕɺ௚࿨ܕɺ͓Αͼྻڍܕ͕͋Δ<̏>
   w 4XJGUͰ͸ͦΕͧΕ࣍ͷΑ͏ʹදݱ͞ΕΔ
   w ௚ੵܕɿTUSVDU
   DMBTT౳ͷෳ਺ͷϓϩύςΟΛ·ͱΊ͋͛ͨ΋ͷ
   w ௚࿨ܕɿ"TTPDJBUFE
   WBMVFΛ࣋ͭFOVN
   w ྻڍܕɿ"TTPDJBUFE
   WBMVFΛ࣋ͨͳ͍FOVN
   w ௚࿨ܕͱ௚ੵܕ͕͋Ε͹ͲΜͳσʔλߏ଄Ͱ΋දݱͰ͖Δ<>
   w ྻڍܕ͸௚࿨ܕʹΑͬͯදݱ͞Ε͍ͯΔͱߟ͑ΒΕΔʢओ؍ʣ <̏>IUUQTRJJUBDPNL[@NPSJUBJUFNTEEBFDD
   <>IUUQTCMPHQFOHJONVSBUFDIFOUSZ VUN@TPVSDFGFFE
9. ୅਺తσʔλܕ ͦΕͧΕͷ୅਺తσʔλܕ͕औΓ͏Δ஋ͷ਺ w ௚ੵܕʢTUSVDU
   DMBTTʣ
   w ֤ϓϩύςΟͷऔΓ͏Δ஋ͷ਺ͷੵ
   w ௚࿨ܕʢFOVNʣ
   w ֤έʔεͷऔΓ͏Δ஋ͷ਺ͷ࿨
10. ୅਺తσʔλܕ ͦΕͧΕͷ୅਺తσʔλܕ͕औΓ͏Δ஋ͷ਺ͷྫ w )VNBO͸ݸͷ஋ΛऔΓ͏Δ
    w BHF͸छྨͷ਺஋ΛऔΓ͏Δ
    w JT8PNBO͸USVFͱGBMTFͷछྨͷ஋Λ औΓ͏Δ
    w (FOEFS͸̎ݸͷ஋ΛऔΓ͏Δ
    w XPNBOͱNBO struct Human { let age: Int8 let isWoman: Bool } enum Gender { case woman case man }
11. ୅਺తσʔλܕ ͦΕͧΕͷ୅਺తσʔλܕ͕औΓ͏Δ஋ͷ਺ͷྫ w )VNBO͸ݸͷ஋ΛऔΓ͏Δ
    w NBO͸छྨͷ਺஋ΛऔΓ͏Δ
    w XPNBO͸छྨͷ਺஋ΛऔΓ͏Δ enum Human { case man(age: Int8) case woman(age: Int8) }
12. ୅਺తσʔλܕΛ࢖ͬͯίʔυΛ෼ੳ Ϟνϕʔγϣϯ w ٙ໰
    w Ұମɺ͋ΔܕͷΠϯελϯε͕औΓ͏Δ஋ͷ਺Λௐ΂ͯԿͷಘ͕͋ΔΜ ͩʁʁʂʂ
    w ճ౴
    w ίʔυͷෳࡶ౓Λఆྔతʹ෼ੳɾٞ࿦Ͱ͖Δʂʂ
13. ௚ੵܕΛ࢖༻ͯ͠ίʔυ͕ෳࡶʹͳΔྫ લఏ w "OZ0QFSBUJPO͸̍̒௨Γͷ஋ΛऔΔ
    w #PPM͸̎௨Γͷ஋ΛऔΔ
    w #PPM͸̏ݸ͋Δ
    w 0QUJPOBM)PHF&SSPS͸̎௨Γͷ ஋ΛऔΔ
    w /JMͱ<ͳΜ͔΍͹͍> enum HogeError: Error { case ͳΜ͔΍͹͍ } struct AnyOperation { var isExecuting: Bool var isCancelled: Bool var isFinished: Bool var error: HogeError? }
14. ௚ੵܕΛ࢖༻ͯ͠ίʔυ͕ෳࡶʹͳΔྫ ໰୊ఏٞ w JT$BODFMMFEGBMTFͷ࣌ʹFSSPS͸OJM
    w ࣮૷্ɺ্هͷ࢓༷Λҧ൓Ͱ͖Δ
    w JT&YFDVUJOHUSVF͔ͭ JT'JOJTIFEUSVFͷঢ়ଶ͸ଘࡏ͠ͳ͍
    w ࣮૷্ɺ্هͷ࢓༷Λҧ൓Ͱ͖Δ enum HogeError: Error { case ͳΜ͔΍͹͍ } struct AnyOperation { var isExecuting: Bool var isCancelled: Bool var isFinished: Bool var error: HogeError? }
15. ௚ੵܕΛ࢖༻ͯ͠ίʔυ͕ෳࡶʹͳΔྫ ໰୊ఏٞ w JT$BODFMMFEGBMTFͷ࣌ʹFSSPS͸ OJM
    w JT&YFDVUJOHUSVF͔ͭ JT'JOJTIFEUSVFͷঢ়ଶ͸ଘࡏ͠ͳ ͍ enum HogeError: Error { case ͳΜ͔΍͹͍ } struct AnyOperation { var isExecuting: Bool var isCancelled: Bool var isFinished: Bool var error: HogeError? } w ࢓্༷ଘࡏ͠ͳ͍ঢ়ଶΛڐ༰͢Δઃܭ ͷͨΊɺσʔλͷෆ੔߹Λى͜͞ͳ͍ ͨΊʹඞཁҎ্ͷߟྀΛڧ͍ΒΕΔ
16. ௚ੵܕΛ࢖༻ͯ͠ίʔυ͕ෳࡶʹͳΔྫ ໰୊ఏٞ w JT$BODFMMFEUSVFͷ࣌ʹ͔͠FSSPS ͸ଘࡏ͠ͳ͍
    w JT&YFDVUJOHUSVF͔ͭ JT'JOJTIFEUSVFͷঢ়ଶ͸ଘࡏ͠ͳ ͍ enum HogeError: Error { case ͳΜ͔΍͹͍ } struct AnyOperation { var isExecuting: Bool var isCancelled: Bool var isFinished: Bool var error: HogeError? } w ࢓্༷ଘࡏ͠ͳ͍ঢ়ଶΛڐ༰͢Δઃܭ ͷͨΊɺσʔλͷෆ੔߹Λى͜͞ͳ͍ ͨΊʹඞཁҎ্ͷߟྀΛڧ͍ΒΕΔ ຊ౰͸࣍ͷ̏ঢ়ଶ͚ͩ؅ཧ͍ͨ͠ʂʂʂ
     ࣮ߦத
     ਖ਼ৗऴྃ
     ҟৗऴྃ
     Τϥʔ͕)PHF&SSPSͷԿʹ֘౰͢Δ͔
    ͳͷʹࠓ͸̍̒ঢ়ଶ΋͋Δ😭😭😭
    
17. ௚ੵܕΛ࢖༻ͯ͠ίʔυ͕ෳࡶʹͳΔྫ ௚࿨ܕʹมߋ w ௚࿨ܕʹमਖ਼͢Δ
    w ͜ͷ௚࿨ܕ͸̏ͭͷ஋͔͠औΒͳ͍ͷͰɺ࠷ ΋ϛχϚϜͳઃܭʹͳ͍ͬͯΔ͜ͱΛ֬ೝͰ ͖Δ
    w ௚ੵܕΛ࢖͍ͬͯͨͱ͖͸ύλʔϯͩͬͨͷ Ͱɺ̍̏ύλʔϯ΋ෆཁͳߟྀΛڧ͍ΒΕ͍ͯͨ enum OperationState { case executing case succeed case error(with: Error) }
18. ௚ੵܕΛ࢖༻ͯ͠ίʔυ͕ෳࡶʹͳΔྫ ͦΜͳࣄ͍͍ͪͪߟ͑ͳͯ͘΋ϊϦͰॻ͚Δ͡ΌΜʁͱ͍͏໰ʹରͯ͠ w ࣮ࡍɺҎ্·Ͱઆ໌ͨ͠ࣄΛ͍͍ͪͪܭࢉ͠ͳ͕ΒίʔυΛॻ͘ࣄ͸ଟ͘ͳ͍
    w งғؾͰΘ͔Δ΍Μʂ
    w ͔͠͠ίʔυ͕ෳࡶͩͱײͨ࣌͡ʹɺงғؾͰ͸ͳͦ͘Ε͕ͳͥෳࡶͳͷ͔Λ આ໌Ͱ͖Δͷ͸େࣄ
    w ྫ͑͹ɺίʔυϨϏϡʔͷ࣌ʹɺʮͳΜ͔೉͍͔͠Β௚ͯ͠ʯͱݴΘΕΔΑ Γɺʮߟྀͷඞཁͷແ͍Oݸͷঢ়ଶΛڐ༰͢Δઃܭʹͳ͍ͬͯΔͷͰ௚͠ ͯʯͱఆྔతʹݴΘΕΔํ͕ೲಘײ͋Δ͠ɺݐઃͳٞ࿦ʹܨ͕Δɻ
19. ͓ΘΓʹ w ୅਺తͳσʔλߏ଄ʹ͍ͭͯઆ໌͠·ͨ͠
    w ಉ͡Α͏ͳσʔλߏ଄Λఆٛͯ͠΋ɺ௚࿨ܕͱ௚ੵܕͰऔΓ͏Δ஋ͷ਺͕େ ͖͘ҟΔྫΛ঺հ͠·ͨ͠
    w ιʔείʔυͷෳࡶੑʹؔ͢Δٞ࿦Λఆྔత͔ͭݐઃతʹߦ͏ํ๏Λࣔࠦ͠ ·ͨ͠ !L@LPIFZJʢ5XJUUFSʣ
    
20. Ҿ༻จݙ <>IUUQTHPPHMFHJUIVCJPTXJGU
    <>IUUQTKBXJLJQFEJBPSHXJLJ4JOHMFUPO@&&#'&#$&#
    <̏>IUUQTRJJUBDPNL[@NPSJUBJUFNTEEBFDD
    <>IUUQTCMPHQFOHJONVSBUFDIFOUSZ VUN@TPVSDFGFFE
    
    IUUQTUXJUUFSDPNJOBNJZTUBUVT T
    
    IUUQT[FOOEFWJOBNJZBSUJDMFTCFE