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Javaष͘ͳ͍ ͔Θ͍͍খௗʹ͢Δ - ϝϧΧϦ JP ͷίʔυྫΛަ͑ - by @sintario Nov. 22, 2017 Mercari × Souzoh Android Talk @mercari
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͜͜·ͰΨνͷͰ ർΕ·ͨ͠ΑͶʁ
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ͳͷͰٳܜલͷ ͍ܰʹ͠·͢Ͷ
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ࣗݾհ • @sintario (Chronum Sintario) • ϝϧΧϦࣾྺ22Ίͷ৽ਓΤϯδχΞ • ീԦࢠࢢࡏॅʢژԦઢͱେߐށઢͰձ͑ΔΑʣ • ࠷ۙͷझຯՈఉͷෆཁΛϝϧΧϦͰചΓ͍͞ ͯച্ۚͰࣗ༻ͷ͓ͪΌΛങ͍ړΔ͜ͱʢۙ ˑ͓ʹ͍͞Μͷ࣋ͬͯͳ͍רΛະ༻৽300ԁ റΓͰूΊ͍ͯ·ͨ͠ʣ
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Career Background • JustSystems •Java, XML •ATOK Mac, Tweet ATOK, Objective-C, C++ • Lunascape •Web browser iOS app • DeNA •iOS apps, Android apps •Groovy, νϥγϧ, KenCoM, ͞ΜΆδελ •Healthcare, KenCoM, Ruby on Rails, Swift, Kotlin
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ӈͷਓᐌ͘ http://mercan.mercari.com/entry/2017/09/28/130000
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̏ؒ̕ͷ༗څফԽΛܦͯϝϧΧϦ ͦͷؒͣͬͱՈࣄख͍ ϝϧΧϦ͍ࠐΜͰ·ͨ͠
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Ͱɺٱ͠ͿΓʹ ίʔυॻ͍ͯΔΜ͕ͩ
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Զͦ͏͍͑ ϨϏϡʔ͓͡͞ΜͩͬͨΘ
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Kotlin Λͬͯ ಡΊΔίʔυΛॻ͘
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ͳΜͰࠓ͞ΒͦͷΑʁ
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Android ͓͡͞Μͨͪʹ ݱͰੜ͖ͬͯཉ͍͠
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W○ntedly ͱ͔ݟΔͱ ͜͏͍͏ͷ͍ͬͺ͍ࡌͬͯΔ͚Ͳ ʮฐࣾฏۉྸ20Ͱ͢ʯ ʮຖि༵ۚŰƅŖžŖͯ͠·͢ʯ ͱ͔ͳΜͱ͔
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पΓʹ̏̌ޙա͗ͨ ΤϯδχΞԿਓ͍ΔΑʁ ελʔτΞοϓͷࣾͱ͔CTOͱ͔ʹͳΔͷ͔ͳʁ ͳΕΔͷ͔ͳʁ ໘Ͱ10ޙԿ͠·͔ͬͯ͢ݴΘΕͯ͑ΒΕΔʁ Ϛωʔδϝϯτ΄ΜͱʹΓ͍ͨʁ
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͓ͬ͞Μ͕ ΤϯδχΞͱͯ͠ੜ͖Δʹ Α͘ރΕ͍ͯΔ͜ͱ͕େࣄ
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Α͘ރΕ͍ͯΔͱ • ແͳٕज़Ͱແʹ͕࡞ΕΔ • ଟগݹ͍ࣝΛ͍·Θͯ͠एऀʹυϠΕΔ • ଟগษڧ·ͩͰ͖Δɺඈͼ͔ͭͳ͍͚Ͳ Ͱ͖Δ • ʢΒ͘͠ͳ͍ײ͡Ͱ͋Δʣ
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μϝͳރΕํ • ͏ͳΜʹษڧͰ͖ͳ͍Ͱ͢ •֮͑ͨݴޠͻͱͭͰҰੜ৯͍ͬͯ͘ʢJavaͷ ਓͱ͔ʣ •֮͑ͨΠσΟΦϜҎ֎Ͱ͖ͳ͘ͳΔ •ૣ͍ͱ΄Μͱʹ20ͱ͔Ͱؕͬͯ͠·͏
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μϝͳރΕํ
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ͦΜͳ Ѫ͖͓ͬ͢͞Μͨͪʹ Kotlin ΛΊ͍ͨ
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Kotlin ͬͯ Կ͕͋Γ͕͍ͨͷʁ
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͓ͬ͞Μʹͱͬͯخ͍͜͠ͱ ͳΜͳͷʁ Kotlin ͬͯ Կ͕͋Γ͕͍ͨͷʁ
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ʢ৽ͨʹʣ ֮͑Δ͜ͱ͕গͳ͍
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ʢ৽ͨʹʣ ֮͑Δ͜ͱ͕গͳ͍ ݴޠ͕͍͍ҙຯͰශ૬ ͚ͩͲͪΌΜͱݱޠ +BWBͱ͔3VCZͱ͔4XJGUॻ͍ͯͨਓͳΒ ࢀೖোน͍
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ͿͬͪΌ͚ ͜Ε͚ͩͬͯΕ ͍͍͓̺ͩͨ
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ͿͬͪΌ͚ ͜Ε͚ͩͬͯΕ ͍͍͓̺ͩͨ ?., .let, .apply, when, ?: return, companion object, fun
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ͿͬͪΌ͚ ͜Ε͚ͩͬͯΕ ͍͍͓̺ͩͨ ?., .let, .apply, when, ?: return, companion object, fun ͋ͱ . ଧͬͯ Android Studio ઌੜʹڭ͑ͯΒ͍ͳ
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ίϯύΫτͳݴ༿Ͱ Readable ͳ ίʔυ͕ॻ͚Δ
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ݺΜͩʁಡΜͩʁ https://www.mercari.com/jp/search/? keyword=%E3%83%AA%E3%83%BC%E3%83%80%E3%83%96%E3%83%AB %E3%82%B3%E3%83%BC%E3%83%89 ষɹཧղ͍͢͠ίʔυ ষɹ໊લʹใΛ٧ΊࠐΉ ষɹޡղ͞Εͳ໊͍લ ষɹඒ͠͞ ষɹίϝϯτ͖͢͜ͱΛΔ ষɹίϝϯτਖ਼֬Ͱ؆ܿʹ ষɹ੍ޚϑϩʔΛಡΈ͘͢͢Δ ষɹڊେͳࣜΛׂ͢Δ ষɹมͱಡΈ͢͞ ষɹແؔͷԼҐΛநग़͢Δ ষɹҰʹͭͷ͜ͱΛ ষɹίʔυʹࢥ͍ΛࠐΊΔ ষɹ͍ίʔυΛॻ͘ ষɹςετͱಡΈ͢͞ ষɹʮʗ࣌ؒΧϯλʯΛઃܭɾ࣮͢Δ
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obvious by definition Readable ͳΒ ίʔυ͕ಡΈ͍͢
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Readable ͳΒ ͍·͞Β ίʔσΟϯάͷఴ͞Εͳ͍
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Readable ͳΒ ϏδωεϩδοΫʹ ूதͰ͖Δ
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Readable ͳΒ ϏδωεϩδοΫʹ ूதͰ͖Δ ॻ͋͘ͳͨɺಡΉؒ
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Readable ͳίʔυ͕ ॻ͚Δίʔμʔ ࢌ͑ΒΕΔ
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No content
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ͭ·Γ
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Readable ͓͍͍͠
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͓͍͍͠ࢥ͍Λͤͯ͘͞ΕΔ Kotlin ͕͔Θ͍͘ͳΔ
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খௗ ,PUMJO
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͕͔ͩ͠͠
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͓ͬ͞Μ ֶशݶքલͳͷͰ ಓ۩͚ͩ༩͑ΒΕΔͱ ܦݧͷԆઢ্Ͱ͔͠ ͑ͳ͔ͬͨΓ͢Δͷͩʂ
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ྫ͑ ͜Μͳ Java ͕ ͋ͬͨͱ͢Δ͡Όͳ͍Ͱ͔͢ʔ
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public class ModalContentWebActivity extends SchemeWebActivity { public static Intent createIntent(Context context, String url){ return createIntent(context, url, null, null); } public static Intent createIntent(Context context, String url, String funcName, String params){ Intent intent = new Intent(context, ModalContentWebActivity.class); intent.putExtra(S.url, url); intent.putExtra(S.funcName, funcName); intent.putExtra(S.params, params); return intent; }
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Kotlinize it
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ͦͨ͠Β͞ʔ ૉͷ͓ͬ͞Μ ͖ͬͱ͜Μͳͷॻ͘ΜͩΑͶʔ
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public class ModalContentWebActivity extends SchemeWebActivity { public static Intent createIntent(Context context, String url){ return createIntent(context, url, null, null); } public static Intent createIntent(Context context, String url, String funcName, String params){ Intent intent = new Intent(context, ModalContentWebActivity.class); intent.putExtra(S.url, url); intent.putExtra(S.funcName, funcName); intent.putExtra(S.params, params); return intent; }
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?): Intent { return createIntent(context, url, null, null) } fun createIntent(context: Context, url: String?, funcName: String?, params: String?): Intent { val intent = Intent(context, ModalContentWebActivity::class.java) intent.putExtra(S.url, url) intent.putExtra(S.funcName, funcName) intent.putExtra(S.params, params) return intent }
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͔Θ͍͘ͳ͍খௗ Ր+BWBͷʹ͓͍͕͵͚ͳ͍
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·ͣ σϑΥϧτҾͬͯͷ͕ ͋ͬͯͳ
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?): Intent { return createIntent(context, url, null, null) } fun createIntent(context: Context, url: String?, funcName: String?, params: String?): Intent { val intent = Intent(context, ModalContentWebActivity::class.java) intent.putExtra(S.url, url) intent.putExtra(S.funcName, funcName) intent.putExtra(S.params, params) return intent }
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?, funcName: String? = null, params: String? = null): Intent { val intent = Intent(context, ModalContentWebActivity::class.java) intent.putExtra(S.url, url) intent.putExtra(S.funcName, funcName) intent.putExtra(S.params, params) return intent }
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?, funcName: String? = null, params: String? = null): Intent { val intent = Intent(context, ModalContentWebActivity::class.java) intent.putExtra(S.url, url) intent.putExtra(S.funcName, funcName) intent.putExtra(S.params, params) return intent } overload ؔফ͑ͨʂ໌ࣔఆٛҰݸݮ
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apply ͠·͠ΐ͏ͥ
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apply ͠·͠ΐ͏ͥ /** * Calls the specified function [block] with `this` value as its receiver * and returns `this` value. */ @kotlin.internal.InlineOnly public inline fun T.apply(block: T.() -> Unit): T { block(); return this }
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?, funcName: String? = null, params: String? = null): Intent { val intent = Intent(context, ModalContentWebActivity::class.java) intent.putExtra(S.url, url) intent.putExtra(S.funcName, funcName) intent.putExtra(S.params, params) return intent }
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?, funcName: String? = null, params: String? = null): Intent { return Intent(context, ModalContentWebActivity::class.java).apply { putExtra(S.url, url) putExtra(S.funcName, funcName) putExtra(S.params, params) } }
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?, funcName: String? = null, params: String? = null): Intent { return Intent(context, ModalContentWebActivity::class.java).apply { putExtra(S.url, url) putExtra(S.funcName, funcName) putExtra(S.params, params) } } ͜ͷதͰ this ͕ Intent ΠϯελϯεͳͷͰ Ϩγʔόʔهड़Λল͚Δ
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ॻ͖׳ΕΔͨΊͷίπͱͯ͠ ࠷ॳʹ return Hoge() ͬͯॻ͍ͪΌ͔ͬͯΒޙஔम ০͢Δߟ͑ͰΔͱ͍͍͔ ͋ͱ val/var ͷΑ͏ͳҰ࣌มʹड͚औΔߟ͑Λ ࣺͯΔ͜ͱ
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୯Ұࣜؔ͞Βʹ
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?, funcName: String? = null, params: String? = null): Intent { return Intent(context, ModalContentWebActivity::class.java).apply { putExtra(S.url, url) putExtra(S.funcName, funcName) putExtra(S.params, params) } }
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?, funcName: String? = null, params: String? = null) = Intent(context, ModalContentWebActivity::class.java).apply { putExtra(S.url, url) putExtra(S.funcName, funcName) putExtra(S.params, params) }
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?, funcName: String? = null, params: String? = null) = Intent(context, ModalContentWebActivity::class.java).apply { putExtra(S.url, url) putExtra(S.funcName, funcName) putExtra(S.params, params) } ࣜͷΓΛฦ͢Αɺͱ͍͏ײతͳදݱʹɻ return ͱ͔ॻ͍ͨΒಐః
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࠷ॳͱൺֱ͠·͠ΐ͏
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public class ModalContentWebActivity extends SchemeWebActivity { public static Intent createIntent(Context context, String url){ return createIntent(context, url, null, null); } public static Intent createIntent(Context context, String url, String funcName, String params){ Intent intent = new Intent(context, ModalContentWebActivity.class); intent.putExtra(S.url, url); intent.putExtra(S.funcName, funcName); intent.putExtra(S.params, params); return intent; }
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?, funcName: String? = null, params: String? = null) = Intent(context, ModalContentWebActivity::class.java).apply { putExtra(S.url, url) putExtra(S.funcName, funcName) putExtra(S.params, params) }
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class ModalContentWebActivity: SchemeWebActivity() { companion object { fun createIntent(context: Context, url: String?, funcName: String? = null, params: String? = null) = Intent(context, ModalContentWebActivity::class.java).apply { putExtra(S.url, url) putExtra(S.funcName, funcName) putExtra(S.params, params) } ͷ͛͑͢ߦݮΔͶ͑ จࣈݮΔͶ͑
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վΊͯಡΜͰΈΔͱϚδ͍͍ຊ https://www.mercari.com/jp/search/? keyword=%E3%83%AA%E3%83%BC%E3%83%80%E3%83%96%E3%83%AB %E3%82%B3%E3%83%BC%E3%83%89 ষɹཧղ͍͢͠ίʔυ ষɹ໊લʹใΛ٧ΊࠐΉ ষɹޡղ͞Εͳ໊͍લ ষɹඒ͠͞ ষɹίϝϯτ͖͢͜ͱΛΔ ষɹίϝϯτਖ਼֬Ͱ؆ܿʹ ষɹ੍ޚϑϩʔΛಡΈ͘͢͢Δ ষɹڊେͳࣜΛׂ͢Δ ষɹมͱಡΈ͢͞ ষɹແؔͷԼҐΛநग़͢Δ ষɹҰʹͭͷ͜ͱΛ ষɹίʔυʹࢥ͍ΛࠐΊΔ ষɹ͍ίʔυΛॻ͘ ষɹςετͱಡΈ͢͞ ষɹʮʗ࣌ؒΧϯλʯΛઃܭɾ࣮͢Δ
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ͱ͍͏͜ͱͰ • খௗ͔Θ͍͍Αখௗ • ංେͨ͠ෛ࠴Λฦࡁ͢Δ͍ͭͰʹɺ͔Θ͍͍ίʔυʹɻ • ͔Θ͍͍খௗಡΈ͍͢Αɻ • Kotlin Β͘͠খ͔͚ͨ͘͞Β͓͡͞Μ·͍ͩΔΑͬͯݴ͑ ͦ͏ • ฐࣾͰ Kotlin ԽΛ͢͢Ί͍ͯ·͢ͳ͏ʢPRϨϏϡʔͰ َͷΑ͏ʹఴ͍ͯ͠·͢ʣ