Ordering and Ordered - Speaker Deck

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Ordered & Ordering Seiya Izumi

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About Me • Seiya Izumi (@sy_izumi) • Go ͱ Scala ͕ϝΠϯ • ࠷ۙͷϚΠϒʔϜ͸ Vape Ͱ͢

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Ordered ͱ Ordering ʹ͍ͭͯݟ͚ͭͨ͜ͱΛ ࿩͠·͢

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Case Class Λιʔτ͍ͨ͠!

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Ordered τϨΠτ

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Ordered τϨΠτ • compareϝιουΛ࣮૷͢Δ͜ͱͰ “<“ ΍ “>” ͳͲͷൺֱͷΦϖϨʔλ͕࢖͑ΔΑ͏ʹ ͳΔ

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͕ͩ… • ൺֱΛ͢ΔͨΊʹ೚ҙͷΫϥεʹຖճ Ordered τϨΠτΛϛΫεΠϯ͠ͳ͍ͱ͍͚ͳ͍ͷ ͔…? • ఆ͕ٛॻ͖׵͑ΒΕͳ͍ࣄ৘͕͋Δͱ͖͸໽հ ͩͳ • ଞʹ΋΍Γํ͸ͳ͍ͷ͔

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Ordering τϨΠτ

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Ordering τϨΠτ

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Ordering τϨΠτ • ೚ҙͷΫϥεͷू߹ʹର͢Δൺֱͷετϥς δΛ༩͑Δ͜ͱ͕Ͱ͖Δͧ

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SortingΛݟͯΈΔ ͜Ε͸ Context Bound ͷ༧ײ

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ͱ͍͏͜ͱ͸implicitʹͰ͖Δ

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΋ͬͱ Ordering ΛݟͯΈΔ

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Optionͷൺֱ΋༻ҙ͞ΕͯΔ ͜Μͳײ͡ͰimplicitΛ࢖͍ͬͯΖΜͳιʔτ͕༧Ί༻ҙ͞Ε͍ͯΔ

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ோΊ͍ͯΔͱ͜ΜͳίʔυΛൃݟ Ͳ͏΍ΒIterableͷฒͼସ͑ϩδοΫͬΆ͍͜ͱ͸Θ͔Δ

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͜͏͍͏ͷ͕ΠέΔΜͩΖ͏͔

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͜͏͍͏ͷ͕ΠέΔΜͩΖ͏͔ ίϯύΠϧΤϥʔ

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·ͨผͷఆٛΛൃݟ

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·ͨผͷఆٛΛൃݟ Seq্͕ݶڥքʹͳͬͯΔ!

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·ͨผͷఆٛΛൃݟ ͳΔ΄Ͳ Implicits ΛΠϯϙʔτ͢Ε͹͍͍ͷ͔

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͜Ε͸Πέͨʂ

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͡Ό͋͜Ε͸ͳΜͳͷ͔…

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ྺ࢙Λඥղ͘

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GithubΛݟͯΈΑ͏

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ͦΕͬΆ͍΋ͷΛൃݟ

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implicit def Iterable ͷ΄͏ͷ࣮૷͸ Iterable ʹର͚ͯͩ͠ Ordering Λద༻͍ͯͯ͠ɺαϒΫϥεʹ͸ద༻͍ͯ͠ͳ͍ͷ͕ ໰୊ͩɻ͔ͩΒ implicit ϝιου͕2ͭଘࡏ͍ͯ͠ΔΜͰ͸ͳ͍ ͔ͱࢥ͏ɻԿͰ2ͭඞཁͳͷ͔͸஌ΒΜ͚Ͳɻ

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ͪΐͬͱߟ͑ͯΈ͚ͨͲ Iterable ͸ཁૉॱংͷ Ұ؏ੑΛอূ͠ͳ͍͔Β implicit def Iterable ͷ ΄͏͸ফͯ͠͠·͏ͷ͕ଥ౰͡Όͳ͍͔ͳʁ

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ͦͷͱ͓Γͩʂ ফͦ͏ ͦ͏ͩͶɻͦͬͪ͸ফͯ͠ Seq ʹରԠ͢Δ΄͏͚ͩ࢒ͦ͏

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ͱ͍͏͜ͱͰ 2.13 ͔Β͸ Seq ͱ SortedSet ͷ ΈΛ্ݶڥքͱ͢ΔΑ͏ʹ

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Deprecated ʹͳͬͨ Iterable ͘Μ

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୭͕ͳΜͷܦҢͰ ௥Ճͨ͠ͷ͔

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෼͔Βͳ͍

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ίʔυίϝϯτͬͯ େࣄͰ͢Ͷ…

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完