go100tips6-10.pdf - Speaker Deck

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(Pݴޠ5*14Ћ 5PNPLJ0UB /Pd/P 1

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5*1 ੜ࢈ऀଆͷΠϯλʔϑΣΠε 2

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ΠϯλʔϑΣΠε͸Ͳ͜ʹ͋Δ΂͖͔ w ੜ࢈ऀଆ QSPEVDFSTJEF ۩ମతͳ࣮૷͕ॻ͔Εͨύοέʔδଆ w ফඅऀଆ DPOTVNFSTJEF ࢖ΘΕΔ֎෦ύοέʔδଆ 3

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ੜ࢈ऀଆͷΠϯλʔϑΣΠε 4 +BWB΍$Ͱ͸ɺੜ࢈ऀଆʹ ΠϯλʔϑΣΠεΛॻ͘͜ͱ͕ଟ͍ɻ

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ੜ࢈ऀଆͷΠϯλʔϑΣΠε 5 (PͰ͸ੜ࢈ऀଆʹΠϯλʔϑΣΠεΛ ॻ͘ํ͕޷·͍͠ɻ ΠϯλʔϑΣΠεΛੜ࢈ऀଆͰ ެ։ͯ͠͠·͏ͱফඅऀଆͷৼΔ෣͍͕ ੍ݶ͞Εͯ͠·͏ɻ

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ੜ࢈ऀଆͷΠϯλʔϑΣΠε 6 (PͰ͸KBWBͷΑ͏ʹ JNQMFNFOUTΛ໌ࣔ͠ͳ͍ͷͰ ґଘؔ܎͕ͳ͍

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ফඅऀଆʹॻ͘ͱ͸ʁ 7 ফඅऀͱ͸ґଘؔ܎ʹ͓͚Δґଘઌ

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ফඅऀଆʹॻ͘ͱ͸ʁ 8 ফඅऀ ੜ࢈ऀ

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ফඅऀଆʹॻ͘ͱ͸ʁ 9 ফඅऀ ੜ࢈ऀ ґଘؔ܎ٯసͷ๏ଇΛద༻ͤͨ͞ґଘؔ܎Λߟ͑Δͱ "ଆͷύοέʔδʹ#ͷJOUFSGBDFΛॻ͍ͨํ͕Θ͔Γ΍͍͢

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ੜ࢈ऀଆͱফඅऀଆ 10 ফඅऀ ੜ࢈ऀ ফඅऀଆ ੜ࢈ऀଆ ֎෦ύοέʔδΛ࢖͏ଆ ֎෦ύοέʔδ IBOEMFS VTFDBTF VTFDBTF SFQPTJUPSZ

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3FQPTJUPSZͷ໰୊ 11 ͜Ε͸ΠϯλʔϑΣΠε෼཭ͷݪଇʹ൓͢Δ

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ΠϯλʔϑΣΠε෼཭ͷݪଇ *41 *OUFSGBDF4FHSFHBUJPO1SJODJQMF 12 ιϑτ΢ΣΞΛઃܭ͢Δࡍʹ͸ ࢖͍ͬͯͳ͍΋ͷ΁ͷґଘΛճආ͢΂͖ͩͱ͍͏ݪଇ

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શ࠶ར༻ͷݪଇ $31 13 ίϯϙʔωϯτͷϢʔβʹରͯ͠ ࣮ࡍʹ͸࢖Θͳ͍΋ͷ΁ͷґଘΛڧཁͯ͠͸͍͚ͳ͍ Ұॹʹ༻͍ΒΕΔ͜ͱ͕ଟ͍Ϋϥε΍Ϟδϡʔϧ͸ಉ͡ίϯϙʔωϯτʹ·ͱΊΔɻ ࢖͍ͬͯͳ͍ΫϥεΛ࣋ͭίϯϙʔωϯτʹґଘ͠ͳ͍Α͏ʹ͢Δɻ

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શ࠶ར༻ͷݪଇ $31 14 ίϯϙʔωϯτͷϢʔβʹରͯ͠ ࣮ࡍʹ͸࢖Θͳ͍΋ͷ΁ͷґଘΛڧཁͯ͠͸͍͚ͳ͍ Ұॹʹ༻͍ΒΕΔ͜ͱ͕ଟ͍Ϋϥε΍Ϟδϡʔϧ͸ಉ͡ίϯϙʔωϯτʹ·ͱΊΔɻ ࢖͍ͬͯͳ͍ΫϥεΛ࣋ͭίϯϙʔωϯτʹґଘ͠ͳ͍Α͏ʹ͢Δɻ

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3FQPTJUPSZͷ໰୊ 15 ͜Ε͸ΠϯλʔϑΣΠε෼཭ͷݪଇʹ൓͢Δ

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3FQPTJUPSZͷ໰୊ 16 https://go.dev/play/p/hfMn1sv8IGx 6TFS3FQPTJUPSZʹ ෆඞཁͳ΋ͷ͕ͨ͘͞Μ͋Δ

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17 ෆཁͳ΋ͷʹ͸ґଘ͠ͳ͍ʂ

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5*1 ΠϯλʔϑΣΠεΛฦ͢ 18

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ΠϯλʔϑΣΠεϑΝΫτϦ ࠶ܝ ΠϯλʔϑΣΠεΛฦ͢ํ๏͸5JQͰઆ໌ͨ͠ɻ ϙΠϯλΛฦ͢ͷ͕׳ྫత 19

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ΠϯλʔϑΣΠεϑΝΫτϦ ࠶ܝ ΠϯλʔϑΣΠεΛฦ͢ํ๏͸5JQͰઆ໌ͨ͠ɻ ϙΠϯλΛฦ͢ͷ͕׳ྫత 20

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ΠϯλʔϑΣΠεΛฦ͢ 21 ΠϯλʔϑΣΠεΛฦ͢͜ͱ͸ ੜ࢈ऀଆͰ͸΍Δ͜ͱ͸͋·Γ޷·͘͠ͳ͍ ˠJOUFSGBDFΛެ։ͨ͠৔߹ͷ࿩ɻ Ұ౓Ϣʔβʹఏڙͨ͠ΠϯλϑΣʔεΛޙ͔Βมߋ ͢ΔͱطଘͷϢʔβͷίʔυ͕յΕͯ͠·͏ɻ

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ΠϯλʔϑΣΠεΛฦ͢

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ΠϯλʔϑΣΠεΛฦ͢ϝϦοτ 23 ۀ຿Ͱෳ਺ਓͰ։ൃ͢Δ৔߹ɺ୭͔ ͕ΠϯλϑΣʔεʹϝιουΛ௥Ճ ͨ͠ࡍʹɺͦͷΠϯλϑΣʔεΛ࣮ ૷͍ͯ͠ͳ͍TUSVDUΛίϯύΠϧΤ ϥʔʹͰ͖Δ https://go.dev/play/p/XeKfOtLYzji

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TUSVDUΛฦ͢ 24 TUSVDUɺTUSVDUͷϙΠϯλΛ ฦ͢ͱɺϝιουΛ௥Ճͯ͠ ΋Ϣʔβͷίʔυ͸յΕͳ͍ https://go.dev/play/p/SyXc7O9fIY4

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ΠϯλʔϑΣΠεΛฦ͢σϝϦοτ 25 w ελΠϧ͕+BWBʹΑͬͯ͠·͏Մೳੑ w JOUFSGBDFͷํ͕TUSVDUΑΓϝϞϦΛ࢖͏

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ΠϯλʔϑΣΠεͷ͓·͡ͳ͍ 26 (PͷΠϯλʔϑΣΠε͸+BWBͷΑ͏ʹɺJNQMFNFOUT Λ໌ࣔ͠ͳ͍ɻ ҎԼͷ͓·͡ͳ͍Λॻ͘͜ͱͰಉ༷ͷറΓ͕Մೳɻ

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ΠϯλʔϑΣΠεͷ͓·͡ͳ͍ ͓·͡ͳ͍Λ͚ͭΔͱɺstruct͕interfaceͷৼΔ෣͍ Λຬͨ͞ͳ͍ͱ͖ʹɺӈͷΑ͏ʹίϯύΠϧΤϥʔʹ ͳΔɻ https://go.dev/play/p/XQOUPM481UF interfaceΛฦ͢৔߹͸ಛʹҙຯ͕ͳ͍

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ΠϯλʔϑΣΠεͷ͓·͡ͳ͍ structΛฦ͢৔߹͸ɺ ͓·͡ͳ͍Λ͚ͭΔ͜ͱͰ interfaceͷৼΔ෣͍Λຬͨ͞ͳ͍ͱ͖ʹɺίϯύΠϧ ΤϥʔʹͰ͖Δɻ͓·͡ͳ͍͕ͳ͍ͱɺΤϥʔʹͳΒ ͳ͍ɻ https://go.dev/play/p/yeoIy9tt9MY

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݁ہͲͬͪΛฦ͢΂͖͔ interfaceΛฦ͢ͱӈਤͷΑ͏ʹ ґଘ͕ൃੜ͢ΔͷͰɺॊೈ͞ΛٻΊΔ ͷͰ͋Ε͹ɺstructΛฦ͢ํ͕͍͍

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5*1 BOZ͸Կ΋఻͑ͳ͍ 30

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BOZͱ͸ ۭΠϯλʔϑΣΠεJOUFSGBDF\^ͷΤΠϦΞε

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BOZͱ͸ ͲΜͳܕͰ΋อ࣋Ͱ͖Δ ˠա৒ͳҰൠԽ ɹ੩తܕ෇͚ݴޠͷར఺͕ࣦΘΕΔ

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BOZͱ͸ ϝιουͷγάχνϟ͸Ͱ͖Δ͚ͩ໌ࣔతʹ͢Δ BOZ͸Կͷ৘ใ΋࣋ͨͳ͍ͷͰ جຊతʹ͸࢖Θͳ͍

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BOZΛ࢖͏΂͖ͱ͖ Ϛʔγϟϧؔ਺ͳͲ͋ΒΏΔܕΛ ड͚औͬͨΓฦͨ͠Γ͢Δඞཁ͕͋Δͱ͖

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BOZΛ࢖͏΂͖ͱ͖ https://pkg.go.dev/encoding/json#Marshal encoding/jsonͷMarshal

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BOZΛ࢖͏΂͖ͱ͖ database/sqlͷQueryContext https://pkg.go.dev/database/sql#DB.QueryContext SELECT * FROM FOO WHERE id = ?

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5*1 δΣωϦΫε 37

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δΣωϦΫεΛ࢖༻͠ͳ͍ྫ ࠨͷίʔυ͸mapܕ͔ΒΩʔΛશͯग़ྗ͢Δɻ Go Plagyround

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δΣωϦΫεΛ࢖༻͠ͳ͍ྫ NͷΩʔͱ஋͕ଞͷܕͰ͋ͬͨ৔߹ʹ ಈ͔ͳ͘ͳΔɻ ࠨ͸N͕NBQTUSJOHʹͳͬͨͷͰ ίϯύΠϧΤϥʔ

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BOZͰ࣮૷ͨ͠ྫ HFU,FZT͸ɺBOZΛड͚ͱΓɺBOZΛฦ͢ɻ Go Playground

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BOZͰ࣮૷ͨ͠ྫ HFU,FZT͸ɺBOZΛड͚ͱΓɺBOZΛฦ͢ɻ (Pͷ੩తܕ෇͚ͷར఺͕ࣦΘΕΔ ܁Γฦ͠ͷίʔυ͕૿͑ΔՄೳੑ ˠ%3:ݪଇʹ൓͢Δ

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DPNQBSBUJWFͰ࣮૷ͨ͠ྫ ΠϯλʔϑΣΠεಉ༷BOZʹΑΔແବͳந৅Խ͸ආ͚Δ΂͖ NBQͰ͸ɺWBSNNBQ<<>CZUF>JOUͷΑ͏ʹ LFZʹεϥΠεΛऔΔ͜ͱ͸Ͱ͖ͳ͍ɻ

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DPNQBSBUJWFͰ࣮૷ͨ͠ྫ 5DPNQBSBCMFͱ͸ɺ૊ΈࠐΈͷΠϯλʔϑΣΠεɻ 5DPNQBSBCMF͸΍ͰൺֱՄೳͳ஋ͷΈҾ਺ʹड͚औΔ͜ͱ͕ՄೳʹͳΔɻ

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DPNQBSBUJWFͰ࣮૷ͨ͠ྫ BOZܕͷ୅ΘΓʹDPNQBSBCMFΛ༻͍Δ https://go.dev/play/p/ENyS1GKu3IU

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ಠࣗͷܕ੍໿Λఆٛ͢Δ https://go.dev/play/p/VHKfcvYQNua VOJPOTΛ༻͍Δͱ ΠϯλʔϑΣΠεͰಠࣗͷܕ੍໿Λ ఆٛ͢Δ͜ͱ͕Ͱ͖Δ

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VOJPOTͱ͸ ෳ਺ͷܕΛड͚औΕΔΑ͏ʹͰ͖Δ

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ಠࣗͷܕ੍໿Λఆٛ͢Δ VOJPOTΛؚΉΠϯλϑΣʔε͸ܕ੍໿Ͱ͔͠࢖͑ͳ͍ɻ WBSYDVTUPN$POTUSBJOUͷΑ͏ʹ͸Ͱ͖ͳ͍ɻ

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δΣωϦΫεͷ஫ҙ ϝιουͰ͸࢖༻Ͱ͖ͳ͍ɻ ؔ਺͸Մೳ

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δΣωϦΫεͷ஫ҙ TUSVDUͰ͸࢖༻Ͱ͖Δɻ

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δΣωϦΫεͷ஫ҙ ࠨ͸ɺಠࣗͷܕ੍໿ΛTUSVDUʹ࣋ͨͤͨྫ (P1MBZHPSVOE

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δΣωϦΫεͷ஫ҙ JOUFSGBDFʹTUSDVUΛFNCFEͰ͖Δ ͔͠͠ɺϑΟʔϧυʹ͸ΞΫηεͰ͖ͳ͍ɻ

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δΣωϦΫεͷ஫ҙ ͜Ε΋ίϯύΠϧΤϥʔ

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δΣωϦΫεͷ஫ҙ δΣωϦΫε͸͋͘·Ͱ΋ܕ੍໿ͷΈɻ ࣮ࡍʹϑΟʔϧυʹΞΫηε͢Δ͜ͱ͸Ͱ͖ͳ͍ɻ

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dJOUWTJOU dJOU͸JOUΛϕʔεͱ͢ΔܕΛશͯड͚औΕΔ https://go.dev/play/p/E3kcU9-7TJ6

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δΣωϦΫεΛ࢖༻͢΂͖ͱ͖ w σʔλߏ଄ FHόΠφϦπϦʔɺ࿈݁Ϧετɺώʔϓ w εϥΠεɺϚοϓɺ͓Αͼ೚ҙͷλΠϓͷνϟωϧͰಈ࡞͢Δؔ਺ w δΣωϦΫεΛ࢖ͬͯৼΔ෣͍Λந৅Խ͢Δ

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εϥΠεɺϚοϓɺ͓Αͼ೚ҙͷλΠϓͷνϟωϧͰಈ࡞͢Δؔ਺ δΣωϦΫεΛ࢖༻͢΂͖ͱ͖

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δΣωϦΫεΛ࢖ͬͯৼΔ෣͍Λந৅Խ͢Δ δΣωϦΫεΛ࢖༻͢΂͖ͱ͖

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δΣωϦΫεΛ࢖༻͢΂͖Ͱ͸ͳ͍ͱ͖ w ड͚औͬͨҾ਺ͷϝιουΛ࢖༻͢Δͱ͖ w δΣωϦΫεΛ࢖͏͜ͱͰίʔυ͕ෳࡶʹͳΔͱ͖ (Pͷ։ൃऀ͸೥ؒδΣωϦΫεͳ͠Ͱ΍͖ͬͯͨ

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δΣωϦΫεΛ࢖༻͢΂͖Ͱ͸ͳ͍ͱ͖ ड͚औͬͨҾ਺ͷϝιουΛ࢖༻͢Δͱ͖ͷྫ

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5*1 ܕͷຒΊࠐΈ 60

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TUSVDUͷ&NCFEEJOH &NCFEEJOHͷઆ໌ࣗମ͸5JQͰղઆ͠·ͨ͠ͷͰ ͦͪΒͷεϥΠυΛࢀর͍ͯͩ͘͠͞ɻ https://speakerdeck.com/tomo1227/goyan-yu-100tips-no-dot-1-5-matome?slide=91

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TUSVDUͷ&NCFEEJOH ࠶ܝ 4USVDUʹTUSVDUΛFNCFE 62

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ܕͷຒΊࠐΈ w ϑΟʔϧυ΁ͷΞΫηεΛ؆୯ʹ͢ΔͨΊͷγϯλοΫεγϡΨʔͱ͠ ͯɺ࢖༻ͯ͠͸ͳΒͳ͍ɻʢ 'PP#BS#B[ ͷ୅ΘΓʹ 'PP#B[ ͳͲʣ ͜Ε͕།ҰͷࠜڌͰ͋Δ৔߹͸ɺ಺෦ͷܕΛຒΊࠐ·ͣɺ୅ΘΓʹϑΟ ʔϧυΛ࢖͏ w ֎෦͔ΒӅṭ͍ͨ͠σʔλ΍ৼΔ෣͍ΛϓϩϞʔτͯ͠͸͍͚ͳ͍ɻ ߏ଄ମ಺ͷඇެ։Ͱ͋Δ΂͖ϩοΫಈ࡞ʹΫϥΠΞϯτ͕ΞΫηεͰ͖ ΔΑ͏ʹ͢Δ৔߹ͳͲ 63

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ܕͷຒΊࠐΈͷ໰୊ 64 Ұݟӈͷίʔυͷํ͕ݟ΍͘͢ྑͦ͞͏͕ͩɺ΍ͬͯ͸͍͚ͳ͍μϝͳྫ ❌ ⭕

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ܕͷຒΊࠐΈͷ໰୊ 65 ΋͠ɺެ։͞ΕͨΠϯλʔϑΣΠεʹIncϝ ιουΛؚΉ৔߹ʹɺΫϥΠΞϯτ͔Β Lock()΍Unlock()͕ݟ͑ͯ͠·͏

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ܕͷຒΊࠐΈͷ໰୊ 66 ಉ໊͡લͷϑΟʔϧυ͕ଘࡏ͢Δͱ͖͸ɺFNCFEEJOHΛ ߦ͏ͱͲͷϑΟʔϧυʹΞΫηε͍ͯ͠Δͷ͔͕ ෼͔Γʹ͘͘ͳΔɻ

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ܕͷຒΊࠐΈ 67 ͲͪΒ΋ΫϥΠΞϯτ͔ΒݟΔͱɺ 8SJUF $MPTFS Λެ։͍ͯ͠Δ͜ͱʹ͸ มΘΒͳ͍ˠແବͳίʔυΛݮΒͤΔ

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·ͱΊ w ܕຒΊࠐΈ͸ɺϘΠϥʔϓϨʔτίʔυ ݴޠ࢓্༷ল͘ࣄ͕Ͱ͖ ͳ͍ఆܕతͳίʔυ Λճආ͢Δͷʹ໾ཱͭ w ެ։͢ΔͨΊ͚ͩʹߦ͍ɺӅ͞ΕΔ΂͖ཁૉΛϓϩϞʔτ͠ͳ͍ Α͏ʹ͢Δ