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શ෦େా͞Μ͕Γ·ͨ͠ ۙ౻͏͓ͪ(.01FQBCP *OD '.FFUVQ'VLVPLB ϖύϘ͞Μͱ͜ͷLTͳৗ
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ۙ౻ Ӊஐ࿕ / @udzura https://blog.udzura.jp/ Uchio Kondo GMOϖύϘ ٕज़෦ ٕज़ج൫νʔϜ RubyKaigi 2019 Local Organizer CNDF 2019 Chair ࠷ۙͷझຯ: DuolingoͰະͷݴޠΛֶश͢Δ͜ͱ
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ΞδΣϯμ wϖύϘY,VCFSOFUFTར༻͍ͯ͠ΔϓϥοτϑΥʔϜʹ͍ͭͯ wࡌ͍ͤͯΔΞϓϦέʔγϣϯʹ͍ͭͯ wαʔϏε͍ͯ͠ΔΞϓϦέʔγϣϯͰͷରԠ wݚڀ։ൃతͳ༰ʹ͍ͭͯ
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ࠓͷݴ͍༁ w͋·ΓࣗͰखΛಈ͔͍ͯ͠Δ༰͕ͳ͍ w!VE[VSBίϯςφϥϯλΠϜ͔ΒԼ͕͖ͳਓؒͰɺ,VCFSOFUFT ͦΕΛ༻͍ͨΞϓϦέʔγϣϯΩϟονΞοϓதͱ͍͏ͱ͜Ζ͕ ͋Γ wͦͷޙͷͰ͍͖ͳΓ͘ͳΔՄೳੑ͕͋Γ·͢
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ϓϥοτϑΥʔϜ
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,VCFSOFUFTPO 0QFO4UBDLPO ϕΞϝλϧ
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/ZBIϓϥΠϕʔτΫϥυ wϖύϘࣾͰηϧϑϗετ͍ͯ͠Δ0QFO4UBDL w͍ΘΏΔϓϥΠϕʔτΫϥυ w%$ࣗମؔ࿈ձ͕͔ࣾͩͦ͜Β্શମʹࣗྗ
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/,4/ZBI,VCFSOFUFT4FSWJDF w͜ͷ/ZBIͷ্ʹ,VCFSOFUFTΫϥελΛߏங w0QFO4UBDL(JU)VC&OUFSQSJTFͱ࿈ܞ͍ͯ͠Δ w(JU)VC&OUFSQSJTFͷϢʔβͰͷೝূ wIUUQTHJUIVCDPNUBLBJTIJLTHJUIVCBVUI w0QFO4UBDL4FDVSJUZ(SPVQΛཧ͢Δ$3% wIUUQTSFQMJOGPBSDIJWFT
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4FMG)PTUFE,VCFSOFUFT wৄࡉS@UBLBJTIJ͞ΜͷൃදͳͲ
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OLFʹΑΔΫϥελ࡞ࣗಈԽ wॾʑΛΈ߹Θͤɺ,VCFSOFUFTΫϥελͷ࡞ɺߋ৽ɺεέʔϧΞ τͳͲΛߦ͏ίϚϯυΛ(PͰॻ͍͍ͯΔ w/,& /ZBI,VCFSOFUFT&OHJOF
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0XBEBϨΠϠʔͷΓग़͠ wϑϩϯτͷϩʔυόϥϯαେ͖ͳ%#ͳͲϚωʔδυαʔϏεత ʹɺେ౷ҰͰڧ͍ϋʔυΛ͍Γग़͍ͯ͠Δ w,BGLBɺ(SBZMPHɺ7BVMUͳͲ͕ࡌ͍ͬͯΔ
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7BVMUͷ׆༻ wΫϥυωΠςΟϒػີཧػߏͱͯ͠7BVMUΛϗετ͍ͯ͠Δ w,VCFSOFUFT1,*ʢ,VCFSOFUFTͷ෦ΞΫηεͷೝূʹར༻ʣ wIUUQTLVCFSOFUFTJPKBEPDTTFUVQDFSUJpDBUFT wLVCFDPOpHͷཧ wΫϥελ͝ͱͷઃఆɺͳͲ w,T4FDSFUTݪଇར༻͍ͯ͠ͳ͍ ൿಗใͷείʔϓ͕Ұ͔ͭ͠ͳ͍ɺͳͲཁ݅తʹݫ͍͠
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ΞϓϦέʔγϣϯ
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ESPOF wESPOFJP044ͰΠϯετʔϧܕͷӡ༻Մೳͳ$*αʔϏε w͔Β,VCFSOFUFTͰͷ ϗεςΟϯάΛαϙʔτ
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"SHP$% w,VCFSOFUFTωΠςΟϒͳϫʔΫϑϩʔΤϯδϯ
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#PU TTTCPU wηΩϡϦςΟνʔϜͰӡ༻͍ͯ͠Δ4MBDL#PU wηΩϡϦςΟো༻ͷΠϯγσϯτ࣌ͷΦϖϨʔγϣϯΛ$IBU0QT Ͱ࣮ࢪͰ͖Δ w ͜Ε୯ମͰͲ͔͜ͷΧϯϑΝϨϯεͰͤͦ͏ͳ͙Β͍ߴػೳ w͜ΕΛ,VCFSOFUFTΫϥελʹσϓϩΠ͍ͯ͠Δ w,VTUPNJ[FϕʔεͰͷϚχϑΣετ࡞ wσϓϩΠ(JU)VC&OUFSQSJTF"SHP$%Ͱ
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͚ࣾαϒυϝΠϯࣗಈׂΓৼΓ wIUUQTUFOTOBQPODPNBSDIJWFT w͚ࣾͷ࣮ݧతͳαʔϏεͳΜ͔ΛखܰʹσϓϩΠͰ͖Δ wFYUFSOBMEOTΛͬͯ3PVUFͱ࿈ܞɺαϒυϝΠϯΛ͍ग़͢ wDFSUNBOBHFSΛͬͯ-FU`T&ODSZQU࿈ܞɺWBMJEʹ5-4Խ w࣮࣭)FS˔LV͡ΌΜ
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ࣗࣾαʔϏε
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NJOOFͷྫ w&,4ʹXFCBQJϩʔϧαʔόΛҠߦࡁΈͰ͋Δ wNJOOFྺ࢙తܦҢͰɺϞϊϦγοΫͳ3BJMTͷΞϓϦέʔγϣϯ ͩͬͨͷͰɺϚΠΫϩαʔϏεԽͱಉ࣌ʹߦͳ͍ͬͯΔ wೝূͷΓग़͠
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ࣗࣾαʔϏεͷϗετʹ͍ͭͯ wࠓͷॴҰ෦ɻϓϥοτϑΥʔϜɺ&,4ͩͬͨΓ/,4ͩͬͨΓ w/,4ͷݕূΛόϦόϦਐΊ͍ͯΔͱ͜Ζ wجຊతʹ/,4ʹد͍͕ͤͨɺطଘͷΠϯϑϥͷঢ়گʹԠͯ͋͡Δఔ ॊೈʹ
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࣍ੈٕज़
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͜ͷΜ͔Β ࢲ͕࣮ࡍʹखΛಈ͔ͨ͠༰
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ϥϯλΠϜͷࣗ࡞ɾݚڀ։ൃ wࣗࣾӡ༻ͷϗεςΟϯάαʔϏεͰ ࣗ࡞ίϯςφϥϯλΠϜΛར༻த w044Ͱެ։ʹ)BDPOJXB w$3*ϥϯλΠϜ0$*ϥϯλΠϜͷ༷ʹ͍ͭͯݚڀ͠ɺকདྷతʹ͜ ͷลΓͷಠࣗϥϯλΠϜΛɺ,VCFSOFUFTͷ044ͱ࿈ܞ͍ͨ͠ͱ͜ Ζ͋Δ
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ίϯςφͷνΣοΫϙΠϯτɾϦετΞ w$3*6ͱ͍͏ٕज़Λݕূதɻ wಈ࡞தͷίϯςφΛμϯϓ͠ʢLWNͷϚΠάϨʔγϣϯͷΑ͏ʹʣϥ ΠϒϚΠάϨʔγϣϯͨ͠Γɺμϯϓͨ͠Πϝʔδ͔ΒͷيಓΛߴ ʹͨ͠Γ͢Δ wઌ΄Ͳͷࣗ࡞ϥϯλΠϜͱͷ࿈ܞΛݕূ
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ίϯςφͷىಈߴԽ w IUUQTTQFBLFSEFDLDPNVE[VSBUIFGBTUFTUXBZUPCPPUTUSBQSVCZPOSBJMT TMJEF!3VCZ,BJHJ w 3P3ͷϓϩδΣΫτΛɺͳʹ ߴԽͷࢪࡦΛ͍ͯ͠ͳ͍ ߹ʹൺഒૣ͘ىಈ w $3*6Πϝʔδ͔Βͷىಈ͕࠷
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τϨʔγϯάʢF#1'ʣ wF#1'ͱ͍͏ɺγεςϜίʔϧτϨʔαωοτϫʔΫͷૢ࡞ͳͲͷ ΧʔωϧϓϩάϥϜΛ҆શɾߴʹॻٕ͘ज़͕͋Δ wίϯςφͷτϥοΩϯάʹར༻Ͱ͖ͳ͍͔ݕূத w#$$ͱ͍͏$ϥΠϒϥϦʢʴЋʣΛ NSVCZʹϙʔτ͍ͯ͠Δ
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F#1'#$$ͷ؆୯ͳσϞ wCBTI@SFBEMJOFͦͷϚγϯͰૢ࡞͞Ε͍ͯΔCBTIͷೖྗΛTOPPQ
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·ͱΊ
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ϖύϘΫϥυωΠςΟϒͳͷͰɺ ਓࡐΛٻΊ͍ͯ·͢ɻ౦ژԬΘͣ 4FFˠ !QC@SFDSVJU