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KOSUKE OGAWA 2020 WebφΠτٶ࡚ No. 10 Ϧςϥϧܕʹ͍ͭͯ

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ࣗݾ঺հ w 0HBXB,PTVLFʢ!LPPHBXBʣ w Ξϧגࣜձࣾʢ౦ژʣ w ٶ࡚͔ΒϑϧϦϞʔτ w J04 4XJGU "OESPJE ,PUMJO 5ZQF4DSJQU $44 7VFKT /VYUKTͳͲ w ࠷ۙ͸ϑϩϯτΤϯυ͕ϝΠϯ

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͋Δ೔ ͱ͋ΔίʔυΛಡΜͰ͍ͨΒɺ ͜ΜͳίʔυΛݟ͚ͭͨ

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w AAͱ͔AAͱ͍͏ܕ͕͋Δʂʁ w BOVNCFSͳΒΘ͔Δ

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• 6 ΍ 2000 ͔͠ڐ͞Εͳ͍ܕ • จࣈྻͷϦςϥϧܕ΋͋Δ • const b: 'bar' = 'foo'; // Τϥʔ: Type '"foo"' is not assignable to type ‘"bar"'. Ϧςϥϧܕͱ͍͏Β͍͠

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• จࣈྻͷϦςϥϧܕΛ࣋ͭ஋͸stringܕͱͯ͠ѻ͏͜ͱ͕Ͱ͖Δ จࣈྻͷϦςϥϧܕ

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• ܕ஫ऍΛলུͯ͠΋ͪΌΜͱਪ࿦͞ΕΔ Ϧςϥϧܕͱܕਪ࿦

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࢖͍ಓ

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• ϝϯόม਺ͷ஋Λมߋͯ͠΄͘͠ͳ͍ͱ͖ ࢖͍ಓ1

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• ϢχΦϯܕͰ݁߹͢Δ ࢖͍ಓ2

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͋Γ͕ͱ͏͍͟͝·ͨ͠