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KOSUKE OGAWA 2020 WebφΠτٶ࡚ No. 10 Ϧςϥϧܕʹ͍ͭͯ
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ࣗݾհ 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 • จࣈྻͷϦςϥϧܕ͋Δ • const b: 'bar' = 'foo'; // Τϥʔ: Type '"foo"' is not assignable to type ‘"bar"'. Ϧςϥϧܕͱ͍͏Β͍͠
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• จࣈྻͷϦςϥϧܕΛ࣋ͭstringܕͱͯ͠ѻ͏͜ͱ͕Ͱ͖Δ จࣈྻͷϦςϥϧܕ
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• ܕऍΛলུͯͪ͠ΌΜͱਪ͞ΕΔ Ϧςϥϧܕͱܕਪ
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͍ಓ
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• ϝϯόมͷΛมߋͯ͠΄͘͠ͳ͍ͱ͖ ͍ಓ1
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• ϢχΦϯܕͰ݁߹͢Δ ͍ಓ2
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͋Γ͕ͱ͏͍͟͝·ͨ͠