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TypeScript リテラル型について

Kosuke Ogawa
September 18, 2020

TypeScript リテラル型について

Webナイト宮崎 Vol.10 ~てげTypeScriptを学びたい~ - connpass https://tegehoge.connpass.com/event/186724/

Kosuke Ogawa

September 18, 2020
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  1. KOSUKE OGAWA 2020
    WebφΠτٶ࡚ No. 10
    Ϧςϥϧܕʹ͍ͭͯ

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

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  3. ͋Δ೔
    ͱ͋ΔίʔυΛಡΜͰ͍ͨΒɺ
    ͜ΜͳίʔυΛݟ͚ͭͨ

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  4. w AAͱ͔AAͱ͍͏ܕ͕͋Δʂʁ
    w BOVNCFSͳΒΘ͔Δ

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  5. • 6 ΍ 2000 ͔͠ڐ͞Εͳ͍ܕ
    • จࣈྻͷϦςϥϧܕ΋͋Δ
    • const b: 'bar' = 'foo'; // Τϥʔ: Type '"foo"' is not assignable to type ‘"bar"'.
    Ϧςϥϧܕͱ͍͏Β͍͠

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  6. • จࣈྻͷϦςϥϧܕΛ࣋ͭ஋͸stringܕͱͯ͠ѻ͏͜ͱ͕Ͱ͖Δ
    จࣈྻͷϦςϥϧܕ

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  7. • ܕ஫ऍΛলུͯ͠΋ͪΌΜͱਪ࿦͞ΕΔ
    Ϧςϥϧܕͱܕਪ࿦

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  8. ࢖͍ಓ

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  9. • ϝϯόม਺ͷ஋Λมߋͯ͠΄͘͠ͳ͍ͱ͖
    ࢖͍ಓ1

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  10. • ϢχΦϯܕͰ݁߹͢Δ
    ࢖͍ಓ2

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  11. ͋Γ͕ͱ͏͍͟͝·ͨ͠

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