Select API from Kotlin Coroutine

4IJCVZBBQL+VNQFJ.BUTVEB LPUMJOYDPSPVUJOFTTFMFDUT 4FMFDU"1*GSPN,PUMJO$PSPVUJOF

2 Jumpei Matsuda @red_fat_daruma A Senior Software Engineer at Drivemode,
Inc. My preferences 👇 Android App and SDK Development Gradle Plugin Development Development Productivity Engineering .F https://www.drivemode.com/

4FMFDU"1*BLB4FMFDU&YQSFTTJPO w Կ೥΋લ͔Βଘࡏ͢ΔͷʹӨ͕ബ͍ ݸਓͷײ૝Ͱ͢ w ଞͷྗٕͰॻ͚ͯ͠·͏৔໘͕ଟ͘ɺؾ͔ͮΕͳ͍ ݸਓͷײ૝Ͱ͢ w
Կ೥΋લ͔Βଘࡏ͢Δͷʹͣͬͱ&YQFSJNFOUBM ࣄ࣮Ͱ͢ 3

4FMFDU"1*BLB4FMFDU&YQSFTTJPO w DPSPVUJOFͷ଴ͪ߹ΘͤΛએݴతʹදݱͰ͖Δ 4

4FMFDU"1*جຊߏ੒ w TFMFDUCVJMEFS"1* w DMBVTFΛొ࿥͢ΔͨΊͷಛघͳ"1* w TFMFDUDMBVTF"1* w $PNQMFUJPO΍TVTQFOTJPOQPJOUͷ͋ΔDPSPVUJOFදݱʹੜ͍͑ͯΔ w
FH%FGFSSFE +PC 3FDFJWF$IBOOFM 4FOE$IBOOFM FUD w جຊ࣮૷͸JOUFSOBMՄࢹੑͰ࣮ݱ͞Ε͓ͯΓɺ৽ن௥Ճ͸ࠔ೉ 5

4FMFDU"1*ͷେ࿮ͷྲྀΕ ˞࣮ࡍʹ͸ඇઢܗ࣮૷ 3FHJTUSBUJPO1IBTF w CVJMEFSͷධՁ֤छTFMFDUDMBVTFΛొ࿥͢Δ 8BJUJOH1IBTF w ొ࿥͞ΕͨTFMFDUDMBVTFͷ׬ྃΛ଴ػ͢Δ
$PNQMFUJPO1IBTF w ݁ՌऔಘͳͲɺొ࿥͞ΕͨTFMFDUDMBVTFͷย෇͚ 6

Θ͔ΒΜ 7

&YQFSJNFOUBMͳͷͰͦͦ͜͜ʹ w DPSPVUJOFͷ଴ͪ߹Θͤʹ࢖͑Δͱ֮͑Δ w ໋ྩతͰ͸ͳ͘એݴతʹදݱͰ͖Δͱ֮͑Δ w ొ࿥ॱΛέΞ͢ΔTFMFDU͔ɺෆఆͷTFMFDU6OCJBTΛ࢖͍෼͚Δͱ֮͑Δ w ಉ࣌ʹෳ਺ͷDPSPVUJOF͕ऴྃ͢Δ͜ͱ͸ك͕ͩ༗ΓಘΔͷͰ஫ҙ 8

ར༻ྫFMWJTPQFSBUPS஍ࠈճආ 9

ར༻ྫίϯςΫετͷ࢓෼͚ 10

ར༻ྫ$IBOOFM؂ࢹύλʔϯ 11

ར༻ྫDPNCJOFͱ[JQͷڱؒ 12 1 2 3 a b c fl PX#
fl PX"

ར༻ྫDPNCJOFͱ[JQͷڱؒ 13 1 2 3 a b c 1a 1b
2b 2c 3c DPNCJOF fl PX# fl PX"

14 1 2 3 a b c 1a 1b 2b
2c 3c 1a 2b 3c DPNCJOF [JQ fl PX# fl PX" ར༻ྫDPNCJOFͱ[JQͷڱؒ

15 1 2 3 a b c 1a 1b 2b
2c 3c 1a 2b 3c DPNCJOF [JQ fl PX# fl PX" 1? 1? 2 2? 3 1 fl PX"͸ͦͷ··ྲྀͭͭ͠ɺ fl PX#ͷཁૉ͕དྷͨΒɺ࠷৽ͷ "ཁૉͱҰॹʹԿ͔͍ͨ͠ ར༻ྫDPNCJOFͱ[JQͷڱؒ

ར༻ྫDPNCJOFͱ[JQͷڱؒ 16 w ղઆ͚ͩͰ෼͔͔ΔͷͰׂѪ w ެࣜͷTBNQMFPQFSBUPS͕ࢀߟʹͳΓ·͢

·ͱΊ w DPSPVUJOFͷ଴ͪ߹ΘͤΛએݴతʹॻ͚Δ w $PSPVUJOFૢ࡞ʹ͋Γ͕ͪͳωετߏ଄ΛݮΒͤΔ w ໋ྩతͳ'MPXૢ࡞Λએݴతͳදݱʹஔ׵Ͱ͖Δ w ίʔυͷ࣮ݱྗ͕޿͕Δ w
ߴ౓ͳ$VTUPN'MPX0QFSBUPSΛ࡞੒Ͱ͖Δ 17

Select API from Kotlin Coroutine

Select API from Kotlin Coroutine

Matsuda Jumpei

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4IJCVZBBQL+VNQFJ.BUTVEB LPUMJOYDPSPVUJOFTTFMFDUT 4FMFDU"1*GSPN,PUMJO$PSPVUJOF

2 Jumpei Matsuda @red_fat_daruma A Senior Software Engineer at Drivemode,

4FMFDU"1*BLB4FMFDU&YQSFTTJPO w Կ೥΋લ͔Βଘࡏ͢ΔͷʹӨ͕ബ͍ ݸਓͷײ૝Ͱ͢ w ଞͷྗٕͰॻ͚ͯ͠·͏৔໘͕ଟ͘ɺؾ͔ͮΕͳ͍ ݸਓͷײ૝Ͱ͢ w

4FMFDU"1*BLB4FMFDU&YQSFTTJPO w DPSPVUJOFͷ଴ͪ߹ΘͤΛએݴతʹදݱͰ͖Δ 4

4FMFDU"1جຊߏ੒ w TFMFDUCVJMEFS"1 w DMBVTFΛొ࿥͢ΔͨΊͷಛघͳ"1* w TFMFDUDMBVTF"1* w $PNQMFUJPO΍TVTQFOTJPOQPJOUͷ͋ΔDPSPVUJOFදݱʹੜ͍͑ͯΔ w

4FMFDU"1*ͷେ࿮ͷྲྀΕ ˞࣮ࡍʹ͸ඇઢܗ࣮૷ 3FHJTUSBUJPO1IBTF w CVJMEFSͷධՁ֤छTFMFDUDMBVTFΛొ࿥͢Δ 8BJUJOH1IBTF w ొ࿥͞ΕͨTFMFDUDMBVTFͷ׬ྃΛ଴ػ͢Δ

Θ͔ΒΜ 7

&YQFSJNFOUBMͳͷͰͦͦ͜͜ʹ w DPSPVUJOFͷ଴ͪ߹Θͤʹ࢖͑Δͱ֮͑Δ w ໋ྩతͰ͸ͳ͘એݴతʹදݱͰ͖Δͱ֮͑Δ w ొ࿥ॱΛέΞ͢ΔTFMFDU͔ɺෆఆͷTFMFDU6OCJBTΛ࢖͍෼͚Δͱ֮͑Δ w ಉ࣌ʹෳ਺ͷDPSPVUJOF͕ऴྃ͢Δ͜ͱ͸ك͕ͩ༗ΓಘΔͷͰ஫ҙ 8

ར༻ྫFMWJTPQFSBUPS஍ࠈճආ 9

ར༻ྫίϯςΫετͷ࢓෼͚ 10

ར༻ྫ$IBOOFM؂ࢹύλʔϯ 11

ར༻ྫDPNCJOFͱ[JQͷڱؒ 12 1 2 3 a b c fl PX#

ར༻ྫDPNCJOFͱ[JQͷڱؒ 13 1 2 3 a b c 1a 1b

14 1 2 3 a b c 1a 1b 2b

15 1 2 3 a b c 1a 1b 2b

ར༻ྫDPNCJOFͱ[JQͷڱؒ 16 w ղઆ͚ͩͰ෼͔͔ΔͷͰׂѪ w ެࣜͷTBNQMFPQFSBUPS͕ࢀߟʹͳΓ·͢

·ͱΊ w DPSPVUJOFͷ଴ͪ߹ΘͤΛએݴతʹॻ͚Δ w $PSPVUJOFૢ࡞ʹ͋Γ͕ͪͳωετߏ଄ΛݮΒͤΔ w ໋ྩతͳ'MPXૢ࡞Λએݴతͳදݱʹஔ׵Ͱ͖Δ w ίʔυͷ࣮ݱྗ͕޿͕Δ w