Kotlinでマッチョ💪💪💪💪💪する話

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KotlinͰ  Ϛονϣ ͢Δ࿩ Retty Tech Cafe #8

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About Me Shinobu Okano @operandoOS Mercari, Inc. Souzoh, Inc.

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ຖ೔30෼ Kotlin΍ͬͯ·͢ • ࡶʹࡶʹϝϞΛ࢒ͯ͠·͢ • http://hack-it-iron.hatenablog.com/archive/ category/Kotlin

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Tuple ෳ਺ݸͷ஋Λ૊Έʹͯ͠·ͱΊͨ΋ͷ

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Α͏͸ Ұ࣌తͳείʔϓͰෳ਺ݸͷσʔλͷ૊Έ߹Θ͕ͤ  ཉ͍͚͠ͲɺClassΛఆٛ͢Δ΄ͲͰ΋ͳ͍ͳʔ  ͬͯ࣌ʹ༗ޮ

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Guild https://github.com/operando/Guild/ Simple java tuples.

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ͳͥTuple͕ඞཁ͔ͩͬͨ • Android + JSON-RPC • http://www.slideshare.net/shinobuokano7/ android-jsonrpc • ཧ༝ॻ͍ͯ͋Δ͔΋ʁ

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KotlinͷPair val pair = 1 to "pair" println(pair.first) // 1 println(pair.second) // pair

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Triple΋͋ΔΑ val triple = Triple(1, true, "Triple") println(triple.first) // 1 println(triple.second) // true println(triple.third) // Triple

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͜ΕΛΈ͓ͯ΋ͬͨ

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͜͏ॻ͚ͳ͍ͷʁ val triple = 1 to true to "Triple"

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͜͏ॻ͚ͳ͍ͷʁ val triple = A to B to C

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ͦͷ··Ͱ͸ॻ͚ͳʔ͍ • Pair in Pairʹͳͬͯ͠·͏ • Pair,C> • ((1,true)"Triple")

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ͳʔΜͩɺΧοίΘΔ͍

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ͦ΋ͦ΋ Pairͷtoͬͯ  Ͳ͏ͳͬͯΔΜͩ?

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ͦ΋ͦ΋ PairͷtoͬͯͲ͏ͳͬͯΔΜͩ? public infix fun .to(that: B)  : Pair = Pair(this, that)

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ͳΔ΄Ͳ

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͍΍ɺ·ͯΑ

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ಉ͡Α͏ʹ֦ுؔ਺  ࡞Ε͹Ͱ͖Δ͔☺

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Pair͔ΒTripleΛ࡞Δ֦ுؔ਺Λॻ͍ͯΈͨ infix fun Pair .to(that: C)  : Triple =   Triple(this.first, this.second, that)

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͡ΌtoͰͭͳ͛ͯ  ॻ͍ͯΈΑ͏

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͡ΌtoͰͭͳ͛ͯॻ͍ͯΈΑ͏ val triple = 1 to true to "Triple" println(triple.first) // 1 println(triple.second) // true println(triple.third) // Triple println(triple.javaClass) // class kotlin.Triple

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Ͱ͖ͨ☺

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΋ͬͱϚοεϧ  ͍ͨ͠Ͱ͠ΐʁ

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4ͭͷ஋Λ࣋ͭ  Tuple QuartetΛ࡞Ζ͏

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4ͭͷ஋Λ࣋ͭTuple QuartetΛ࡞Ζ͏ class Quartet( val first: F, val second: S, val third: T, val fourth: FO,) { override fun toString(): String { return "Quartet(first=$first, second=$second,  third=$third, fourth=$fourth)" } }

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toͭͳ͗ͰQuartetΛ  ࡞ΕΔΑ͏ʹ͢Δ

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Triple͔ΒQuartetΛ࡞Δ֦ுؔ਺Λॻ͘ infix fun Triple .to(that: D): Quartet =   Quartet(this.first, this.second, this.third, that)

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Quartet࢖ͬͯΈΑ͏ val quartet = 1 to 10L to true to "quartet" println(quartet.first) // 1 println(quartet.second) // 10 println(quartet.third) // true println(quartet.fourth) // quartet

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΋ͬͱϚοεϧ  ΄͘͠ͳ͍??

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5ͭͷ஋Λ࣋ͭ  Tuple QuintetΛ࡞Ζ͏

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5ͭͷ஋Λ࣋ͭTuple QuintetΛ࡞Ζ͏ class Quintet( val first: F, val second: S, val third: T, val fourth: FO, val five: FI) { override fun toString(): String { return "Quintet(first=$first, second=$second,  third=$third, fourth=$fourth, five=$five)" } }

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͸͍͸͍ɺtoΛͭͳ͛ͯ  ॻ͍ͯ࡞Γ͍ͨΑͶ

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͸͍͸͍ɺ֦ுؔ਺֦ுؔ਺ infix fun Quartet .to(that: E): Quintet = Quintet(this.first, this.second, this.third, this.fourth, that)

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Quintet࢖ͬͯΈΑ͏ val quintet = 1 to 10L to true to LocalDateTime.now() to "quintet" println(quintet.first) // 1 println(quintet.second) // 10 println(quintet.third) // true println(quintet.fourth) // 2016-12-09T19:45:38.959 println(quintet.five) // quintet

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Libraryʹ͠·ͨ͠

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Guild Kotlin https://github.com/operando/Guild/ tree/master/guild-kotlin ͍͔ͭjCenterͱ͔ʹ͋͛·ʔ͢

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Links • Pair͔ΒTripleΛ࡞Δ֦ுؔ਺Λॻ͍ͯΈͨ - 2016/12/03ͷ30෼ KotlinϝϞ • http://hack-it-iron.hatenablog.com/entry/2016/12/03/165601 • 4ͭͱ5ͭ஋Λ࣋ͭTupleΛ࡞ͬͯΈͨ - 2016/12/04ͷ30෼ KotlinϝϞ • http://hack-it-iron.hatenablog.com/entry/2016/12/04/223509 • TupleϥΠϒϥϦ GuildͷKotlin൛࡞ͬͯΈͨ - 2016/12/09ͷ30෼ KotlinϝϞ • http://hack-it-iron.hatenablog.com/entry/2016/12/09/172657 • Guild • https://github.com/operando/Guild/

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Thanks!