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ͷจࣈྻΛύʔε͠Α͏ Niigata 5min Tech #9 @circled9 1
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ࣗݾհ @circled9 দҪɹਖ਼ࢤ / Matsui Masashi גࣜձࣾϞχΫϧ TypeScriptͰ৭ʑܭࢉ͢ΔࣄΛ ͯ͠·͢ 2
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ͷจࣈྻͷύʔε • JavaScriptͰͷจࣈྻͷύʔε͠·͢ΑͶʁ • parseInt, parseFloat, NumberͷͲΕ͍͍͔͑Έ·ͤΜ ͔ʁ • ͱ͍͏Θ͚Ͱ৭ʑύʔεͯ͠Έ·ͨ͠ 3
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4
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"123" 5
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ී௨ͷͷ߹ > parseInt("123") <- 123 > parseFloat("123") <- 123 > Number("123") <- 123 6
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"123,456" 7
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ܻ̏۠Γͷͷ߹ > parseInt("123,456") <- 123 > parseFloat("123,456") <- 123 > Number("123,456") <- NaN 8
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"123_456" 9
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Numeric Separator • ES2021ͷه๏ • ͷ۠Γจࣈͱͯ͠ΞϯμʔείΞ͕͑Δ > 123_456_789 <- 123456789 10
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ΞϯμʔείΞ۠Γͷͷ߹ > parseInt("123_456") <- 123 > parseFloat("123_456") <- 123 > Number("123_456") <- NaN 11
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ͷ·ͱΊ • parseIntͱparseFloatҎ֎ͷจࣈ͕ग़ͯ͘Δ·Ͱύʔε͢ Δ • Numberมͳจࣈ͕͋ΔͱNaNΛฦ͢ 12
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খ 13
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"1.23" 14
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ී௨ͷখͷ߹ > parseInt("1.23") <- 1 > parseFloat("1.23") <- 1.23 > Number("1.23") <- 1.23 15
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".123" 16
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খͷলུܗͷ߹ > parseInt(".123") <- NaN > parseFloat(".123") <- 0.123 > Number(".123") <- 0.123 17
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"192.168.1.1" 18
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খͰͳ͍Կ͔ͩͬͨ߹ > parseInt("192.168.1.1") <- 192 > parseFloat("192.168.1.1") <- 192.168 > Number("192.168.1.1") <- NaN 19
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খͷ·ͱΊ • parseIntҎ֎ͷจࣈ͕ग़ͯ͘Δ·Ͱύʔε͢Δ • parseFloatখͱͯ͠ύʔεͰ͖Δͱ͜Ζ·Ͱύʔε͢Δ • Numberখͱ͓͔͍ͯ͠͠߹NaNΛฦ͢ 20
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ͦͷଞͷ 21
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"1.234E-5" 22
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ࢦදهͷ߹ > parseInt("1.234E-5") <- 1 > parseFloat("1.234E-5") <- 0.00001234 > Number("1.234E-5") <- 0.00001234 23
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"Infinity" 24
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In fi nityͷ߹ > parseInt("-Infinity") <- NaN > parseFloat("-Infinity") <- -Infinity > Number("-Infinity") <- -Infinity 25
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" 123 " 26
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લޙʹۭന͕͋Δ߹ > parseInt(" 123 ") <- 123 > parseFloat(" 123 ") <- 123 > Number(" 123 ") <- 123 27
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" 1 2 3 " 28
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్தʹۭന͕͋Δ߹ > parseInt(" 1 2 3 ") <- 1 > parseFloat(" 1 2 3 ") <- 1 > Number(" 1 2 3 ") <- NaN 29
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ͦͷଞͷͷ·ͱΊ • parseFloatNumberࢦදهInfinityʹରԠ͍ͯ͠Δ • Ͳͷؔจࣈྻͷલޙͷۭനແࢹ͢Δ • Ͳͷؔจࣈྻͷ్தͷۭനύʔεͰ͖ͳ͍จࣈѻ͍ʹͳΔ 30
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ۭͷ 31
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"" 32
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ۭจࣈͷ߹ > parseInt("") <- NaN > parseFloat("") <- NaN > Number("") <- 0 33
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null 34
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nullͷ߹ > parseInt(null) <- NaN > parseFloat(null) <- NaN > Number(null) <- 0 35
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undefined 36
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unde fi nedͷ߹ > parseInt(undefined) <- NaN > parseFloat(undefined) <- NaN > Number(undefined) <- NaN 37
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ۭͷͷ·ͱΊ • NumberۭനจࣈͱnullΛύʔε͢Δͱ0Λฦ͢ • ҰํɺparseIntͱparseFloatNaNΛฦ͢ • ͲͷؔundefinedΛύʔε͢ΔͱNaNΛฦ͢ 38
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·ͱΊ 39
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·ͱΊ • parseIntࣈͷ෦ΛͰ͖Δ͚ͩύʔε͢Δ • parseFloatখͬΆ͍෦ΛͰ͖Δ͚ͩύʔε͢Δ • Numberมͳจࣈ͕ೖͬͯΔͱNaNΛฦ͢ • Numberͷۭനจࣈͱnullͷڍಈʹҙ 40
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͓·͚ 41
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͜ΕΒҰॹ > parseInt === Number.parseInt <- true > parseFloat === Number.parseFloat <- true 42
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͜ΕҰॹ > +"" === Number("") <- true 43