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कഁ཭ͱιϑτ΢ΣΞ։ൃͷษڧ๏ 2022.9.21 ύʔιϧςΫϊϩδʔελοϑגࣜձࣾ Ѩ෦ ߞೋ koji.abe@persol.co.jp ΤϯδχΞͷษڧ๏ϋοΫLT- vol.10

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• ࣗݾ঺հ • ൃදഎܠ • कഁ཭ͱιϑτ΢ΣΞ։ൃͷษڧ๏ ໨࣍ 2

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• ࣗݾ঺հ • ൃදഎܠ • कഁ཭ͱιϑτ΢ΣΞ։ൃͷษڧ๏ 3

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• ໊લɿѨ෦ɹߞೋ(͋΂ɹ͜͏͡) ϝʔϧ: koji.abe@persol.co.jp • ॴଐɿύʔιϧςΫϊϩδʔελοϑגࣜձࣾ • ҩྍػث։ൃ • ૊ࠐΈιϑτ΢ΣΞ։ൃɻCݴޠɺϕΞϝλϧͷ։ൃۀ຿ܦݧ͕΄ͱΜͲɻ • ϙʔτϑΥϦΦ: https://lapras.com/public/k-abe • twitter: @juraruming ࣗݾ঺հ 4

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• ࣗݾ঺հ • ൃදഎܠ • कഁ཭ͱιϑτ΢ΣΞ։ൃͷษڧ๏ 5

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• લճͷൃද(GitHub૲ۦಈษڧ๏)ޙɺଞͷษڧ๏͕ͳ͍͔ߟ͑ͯΈ·͠ ͨɻ ɹकഁ཭ͱιϑτ΢ΣΞ։ൃʹ͍ͭͯࢥ͏ͱ͜Ζ͕͋ͬͨͷͰࠓճൃද͠ ͍ͨͱࢥ͍·͢ɻ ൃදഎܠ 6

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• ࣗݾ঺հ • ൃදഎܠ • कഁ཭ͱιϑτ΢ΣΞ։ൃͷษڧ๏ 7

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▪कഁ཭ͬͯԿ? कɿઌੜͷڭ͑ΛकΓɺɹɹˠઌੜͷڭ͑ΛकΓɺ࣮ફ͢Δ ഁɿઌੜͷڭ͑ΛഁΔɺɹɹˠࣗ෼ͳΓͷ޻෉Λ͢Δ ཭ɿઌੜͷڭ͔͑Β཭ΕΔɹˠࣗ෼ͷྲྀ೿ΛͨͯΔ ݋ಓΛ΍͍ͬͯͨ͜ͱ΋͋Γɺࣗ෼ͷதʹછΈ෇ֶ͍ͨͼͷύλʔϯͰ͸͋Δ͕ɺ ιϑτ΢ΣΞ։ൃͷษڧ๏ͰΑΓ࠷దͳֶͼͷύλʔϯ͸͋Δ͔?ɺͱߟ͑ͨɻ कഁ཭ͱιϑτ΢ΣΞ։ൃͷษڧ๏ 8

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▪ࣗ෼ͷதͰؾ͖͕ͮ͋ͬͨͷ͸͜ͷπΠʔτΛݟͨͱ͖ɻ Andrew Kelly͞Μɹ2022/3/18 12:15ɹˡZigݴޠ։ൃϦʔμʔ One of my go-to software development tricks: - Have 2 clones of the repo side by side - Implement the a feature the "safe" way in one of them without touching too much code - Simultaneously implement the same feature more daringly, refactoring aggressively in a fit of rage ●Google຋༁ ࢲͷཔΓʹͳΔιϑτ΢ΣΞ։ൃͷൿ݃ͷ 1 ͭ: - Ϩϙͷ 2 ͭͷΫϩʔϯΛฒ΂ͯ഑ஔ͢Δ - ͋·Γʹ΋ଟ͘ͷίʔυʹ৮ΕΔ͜ͱͳ͘ɺͦͷ͏ͪͷ 1 ͭͰػೳΛʮ҆શ ͳʯํ๏Ͱ࣮૷͠·͢ - ಉ͡ػೳΛΑΓେ୾ʹಉ࣌ʹ࣮૷͠ɺౖΓڰͬͯੵۃతʹϦϑΝΫλϦϯά͢Δ कഁ཭ͱιϑτ΢ΣΞ։ൃͷษڧ๏ 9

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▪ࣗ෼ͷதͰؾ͖͕ͮ͋ͬͨͷ͸͜ͷπΠʔτΛݟͨ͜ͱɻ ●Google຋༁ ࢲͷཔΓʹͳΔιϑτ΢ΣΞ։ൃͷൿ݃ͷ 1 ͭ: - Ϩϙͷ 2 ͭͷΫϩʔϯΛฒ΂ͯ഑ஔ͢Δ - ͋·Γʹ΋ଟ͘ͷίʔυʹ৮ΕΔ͜ͱͳ͘ɺͦͷ͏ͪͷ 1 ͭͰػೳΛʮ҆શ ͳʯํ๏Ͱ࣮૷͠·͢ ɹ→कഁ཭ͷकʹؔ࿈͢Δ͔ͳͱײͨ͡ɻ - ಉ͡ػೳΛΑΓେ୾ʹಉ࣌ʹ࣮૷͠ɺౖΓڰͬͯੵۃతʹϦϑΝΫλϦϯά͢ Δ ɹ→कഁ཭ͷഁɾ཭ʹؔ࿈͢Δ͔ͳͱײͨ͡ɻ कഁ཭ͱιϑτ΢ΣΞ։ൃͷษڧ๏ 10

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▪πΠʔτΛݟͯײͨ͡ߟ͑ ɹʲࣗ෼ͷதͰେࣄʹ͢Δڭ͑͸࣋ͪͭͭ΋ɺ ɹࣗ෼ͳΓͷ૑ҙɾ޻෉Λࢼߦ͢Δ͜ͱ΋େࣄͩͳʳͱ͍͏͜ͱʹؾ͚ͮͨɻ ɹਤʹ͢Δͱ͜Μͳײ͡ɻ ɹɹ कഁ཭ͱιϑτ΢ΣΞ։ൃͷษڧ๏ 11 ೔ʑͷʲकʳͷ࣮ફ ࣗ෼ͳΓͷ૑ҙɾ޻෉ͷࢼߦ ͜ͷੵΈॏͶ͕কདྷͷʲഁɾ཭ʳʹੜ͖ͦ͏ɻ

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͝੩ௌ͋Γ͕ͱ͏ ͍͟͝·ͨ͠ɻ ऴΘΓ 12