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શ෦େ࿨ా͞Μ͕΍Γ·ͨ͠ ۙ౻͏͓ͪ(.01FQBCP *OD '.FFUVQ'VLVPLB ϖύϘ͞Μͱ͜ͷLTͳ೔ৗ

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ۙ౻ Ӊஐ࿕ / @udzura https://blog.udzura.jp/ Uchio Kondo GMOϖύϘ ٕज़෦ ٕज़ج൫νʔϜ RubyKaigi 2019 Local Organizer CNDF 2019 Chair ࠷ۙͷझຯ: DuolingoͰະ஌ͷݴޠΛֶश͢Δ͜ͱ

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ΞδΣϯμ wϖύϘY,VCFSOFUFTར༻͍ͯ͠ΔϓϥοτϑΥʔϜʹ͍ͭͯ wࡌ͍ͤͯΔΞϓϦέʔγϣϯʹ͍ͭͯ wαʔϏε͍ͯ͠ΔΞϓϦέʔγϣϯͰͷରԠ wݚڀ։ൃతͳ಺༰ʹ͍ͭͯ

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ࠓ೔ͷݴ͍༁ w͋·Γࣗ෼ͰखΛಈ͔͍ͯ͠Δ಺༰͕ͳ͍ w!VE[VSB͸ίϯςφϥϯλΠϜ͔ΒԼ͕޷͖ͳਓؒͰɺ,VCFSOFUFT ΍ͦΕΛ༻͍ͨΞϓϦέʔγϣϯ͸ΩϟονΞοϓதͱ͍͏ͱ͜Ζ͕ ͋Γ wͦͷ෼ޙ൒ͷ࿩Ͱ͍͖ͳΓ೤͘ͳΔՄೳੑ͕͋Γ·͢

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ϓϥοτϑΥʔϜ

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,VCFSOFUFTPO 0QFO4UBDLPO ϕΞϝλϧ

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/ZBIϓϥΠϕʔτΫϥ΢υ wϖύϘࣾ಺Ͱηϧϑϗετ͍ͯ͠Δ0QFO4UBDL w͍ΘΏΔϓϥΠϕʔτΫϥ΢υ w%$ࣗମ͸ؔ࿈ձ͕͔ࣾͩͦ͜Β্͸શମʹࣗྗ

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/,4/ZBI,VCFSOFUFT4FSWJDF w͜ͷ/ZBIͷ্ʹ,VCFSOFUFTΫϥελΛߏங w0QFO4UBDL(JU)VC&OUFSQSJTFͱ࿈ܞ͍ͯ͠Δ w(JU)VC&OUFSQSJTFͷϢʔβͰͷೝূ wIUUQTHJUIVCDPNUBLBJTIJLTHJUIVCBVUI w0QFO4UBDL4FDVSJUZ(SPVQΛ؅ཧ͢Δ$3% wIUUQTSFQMJOGPBSDIJWFT

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4FMG)PTUFE,VCFSOFUFT wৄࡉ͸S@UBLBJTIJ͞ΜͷൃදͳͲ

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OLFʹΑΔΫϥελ࡞੒౳ࣗಈԽ wॾʑΛ૊Έ߹Θͤɺ,VCFSOFUFTΫϥελͷ࡞੒ɺߋ৽ɺεέʔϧΞ ΢τͳͲΛߦ͏ίϚϯυΛ(PͰॻ͍͍ͯΔ w/,& /ZBI,VCFSOFUFT&OHJOF

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0XBEBϨΠϠʔͷ੾Γग़͠ wϑϩϯτͷϩʔυόϥϯα΍େ͖ͳ%#ͳͲ͸ϚωʔδυαʔϏεత ʹɺେ౷ҰͰڧ͍ϋʔυΛ࢖͍੾Γग़͍ͯ͠Δ w,BGLBɺ(SBZMPHɺ7BVMUͳͲ͕ࡌ͍ͬͯΔ

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7BVMUͷ׆༻ wΫϥ΢υωΠςΟϒػີ؅ཧػߏͱͯ͠7BVMUΛϗετ͍ͯ͠Δ w,VCFSOFUFT1,*ʢ,VCFSOFUFTͷ಺෦ΞΫηεͷೝূʹར༻ʣ wIUUQTLVCFSOFUFTJPKBEPDTTFUVQDFSUJpDBUFT wLVCFDPOpH౳ͷ؅ཧ wΫϥελ͝ͱͷઃఆɺͳͲ w,T4FDSFUT͸ݪଇར༻͍ͯ͠ͳ͍
 ൿಗ৘ใͷείʔϓ͕Ұ͔ͭ͠ͳ͍ɺͳͲཁ݅తʹݫ͍͠

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ΞϓϦέʔγϣϯ

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ESPOF wESPOFJP͸044ͰΠϯετʔϧܕͷӡ༻΋Մೳͳ$*αʔϏε w͔Β,VCFSOFUFTͰͷ
 ϗεςΟϯάΛαϙʔτ

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"SHP$% w,VCFSOFUFTωΠςΟϒͳϫʔΫϑϩʔΤϯδϯ

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#PU TTTCPU wηΩϡϦςΟνʔϜͰӡ༻͍ͯ͠Δ4MBDL#PU wηΩϡϦςΟ΍ো֐༻ͷΠϯγσϯτ࣌ͷΦϖϨʔγϣϯΛ$IBU0QT Ͱ࣮ࢪͰ͖Δ w ͜Ε୯ମͰ΋Ͳ͔͜ͷΧϯϑΝϨϯεͰ࿩ͤͦ͏ͳ͙Β͍ߴػೳ w͜ΕΛ,VCFSOFUFTΫϥελʹσϓϩΠ͍ͯ͠Δ w,VTUPNJ[FϕʔεͰͷϚχϑΣετ࡞੒ wσϓϩΠ͸(JU)VC&OUFSQSJTF"SHP$%Ͱ

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ࣾ಺޲͚αϒυϝΠϯࣗಈׂΓৼΓ wIUUQTUFOTOBQPODPNBSDIJWFT wࣾ಺޲͚ͷ࣮ݧతͳαʔϏεͳΜ͔ΛखܰʹσϓϩΠͰ͖Δ wFYUFSOBMEOTΛ࢖ͬͯ3PVUFͱ࿈ܞɺαϒυϝΠϯΛ෷͍ग़͢ wDFSUNBOBHFSΛ࢖ͬͯ-FU`T&ODSZQU࿈ܞɺWBMJEʹ5-4Խ w࣮࣭)FS˔LV͡ΌΜ

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ࣗࣾαʔϏε

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NJOOFͷྫ w&,4ʹXFCBQJϩʔϧαʔόΛҠߦࡁΈͰ͋Δ wNJOOF͸ྺ࢙తܦҢͰɺϞϊϦγοΫͳ3BJMTͷΞϓϦέʔγϣϯ ͩͬͨͷͰɺϚΠΫϩαʔϏεԽͱಉ࣌ʹߦͳ͍ͬͯΔ wೝূͷ੾Γग़͠౳

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ࣗࣾαʔϏεͷϗετʹ͍ͭͯ wࠓͷॴҰ෦ɻϓϥοτϑΥʔϜ΋ɺ&,4ͩͬͨΓ/,4ͩͬͨΓ w/,4ͷݕূΛόϦόϦਐΊ͍ͯΔͱ͜Ζ wجຊతʹ͸/,4ʹد͍͕ͤͨɺطଘͷΠϯϑϥͷঢ়گʹԠͯ͋͡Δఔ ౓ॊೈʹ

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࣍ੈ୅ٕज़

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͜ͷ΁Μ͔Β ࢲ͕࣮ࡍʹखΛಈ͔ͨ͠಺༰

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ϥϯλΠϜͷࣗ࡞ɾݚڀ։ൃ wࣗࣾӡ༻ͷϗεςΟϯάαʔϏεͰ
 ࣗ࡞ίϯςφϥϯλΠϜΛར༻த w044Ͱެ։ʹ)BDPOJXB w$3*ϥϯλΠϜ0$*ϥϯλΠϜͷ࢓༷ʹ͍ͭͯ΋ݚڀ͠ɺকདྷతʹ͜ ͷลΓͷಠࣗϥϯλΠϜΛɺ,VCFSOFUFT౳ͷ044ͱ࿈ܞ͍ͨ͠ͱ͜ Ζ͸͋Δ

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ίϯςφͷνΣοΫϙΠϯτɾϦετΞ w$3*6ͱ͍͏ٕज़Λݕূதɻ wಈ࡞தͷίϯςφΛμϯϓ͠ʢLWNͷϚΠάϨʔγϣϯͷΑ͏ʹʣϥ ΠϒϚΠάϨʔγϣϯͨ͠Γɺμϯϓͨ͠Πϝʔδ͔ΒͷيಓΛߴ଎ ʹͨ͠Γ͢Δ wઌ΄Ͳͷࣗ࡞ϥϯλΠϜͱͷ࿈ܞΛݕূ

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ίϯςφͷىಈߴ଎Խ w IUUQTTQFBLFSEFDLDPNVE[VSBUIFGBTUFTUXBZUPCPPUTUSBQSVCZPOSBJMT TMJEF!3VCZ,BJHJ w 3P3ͷϓϩδΣΫτΛɺͳʹ΋
 ߴ଎ԽͷࢪࡦΛ͍ͯ͠ͳ͍
 ৔߹ʹൺ΂ഒૣ͘ىಈ w $3*6Πϝʔδ͔Βͷىಈ͕࠷଎

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τϨʔγϯάʢF#1'ʣ wF#1'ͱ͍͏ɺγεςϜίʔϧτϨʔα΍ωοτϫʔΫͷૢ࡞ͳͲͷ ΧʔωϧϓϩάϥϜΛ҆શɾߴ଎ʹॻٕ͘ज़͕͋Δ wίϯςφͷτϥοΩϯάʹར༻Ͱ͖ͳ͍͔ݕূத w#$$ͱ͍͏$ϥΠϒϥϦʢʴЋʣΛ
 NSVCZʹϙʔτ͍ͯ͠Δ

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F#1'#$$ͷ؆୯ͳσϞ wCBTI@SFBEMJOFͦͷϚγϯͰૢ࡞͞Ε͍ͯΔCBTI΁ͷೖྗΛTOPPQ

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·ͱΊ

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ϖύϘ͸Ϋϥ΢υωΠςΟϒͳͷͰɺ ਓࡐΛٻΊ͍ͯ·͢ɻ౦ژ෱Ԭ໰Θͣ 4FFˠ !QC@SFDSVJU