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      "author": "promari",
      "permlink": "programming-news-qiita-july-15-2019-vol-1",
      "title": "【Programming News】Qiitaまとめ記事 July 15, 2019 Vol.1",
      "body": "2019/7/15(月)に気になったQiitaの記事をまとめました。\n\n![mjxlrb5urr.jpg](https://img.esteem.ws/mjxlrb5urr.jpg)\n\n#### Java\n- Spring Boot\n  - [IntelliJ+Gradle+SpringBoot+JUnit5(jupiter)で新規開発を始めるときの備忘録](https://qiita.com/tan3_sugarless/items/e1a857067896cf43dd2a)\n  - [mybatis-spring-boot-starter 2.1の変更点](https://qiita.com/kazuki43zoo/items/3d39543fd1234118f3bc)\n\n#### Kotlin\n- Tips\n  - [Kotlinでjava-jwtを使ってTokenを見てみる](https://qiita.com/dddEn/items/48d2f2e2c8f98209e192)\n\n#### Python\n- Beginner\n  - [Pythonで分数を取り扱う話](https://qiita.com/sakabe/items/0333f06cc6064a70cc93)\n  - [Django 汎用ビュー入門1](https://qiita.com/kRysTasis/items/9a62a57ba9c03f0fe7a2)\n- Tips\n   - [Python⇔Excelで日本語メール送信の自動化](https://qiita.com/ReiKitaya/items/128c9137bb90ebb64265)\n\n#### Ruby\n- Beginner\n  - [Rubyの特徴](https://qiita.com/Naru-taka/items/2317803391acd5988577)\n- Apps\n  - [RubyでLINEのBot開発をしよう-アンケート集計Bot-【ステップ1】](https://qiita.com/noriya1217/items/00d6461e9f54900377a3)\n\n#### Rails\n- Beginner\n  - [CentOSにRuby on Rails開発環境を構築する方法（CentOS7.6 Ruby2.6.3 Rails 5.2.3）](https://qiita.com/setoneno/items/3b316461531671a4abf1)\n- OAuth\n  - [RailsアプリでFacebook/Twitter/GitHubのOAuth認証を可能にした](https://qiita.com/artistan/items/977551c32d4b9c402660)\n- Tips\n  - [Railsで投稿とカテゴリの紐付け機能を実装する](https://qiita.com/cawaz3/items/e755a58177212f2aca6c)\n  - [[Rails]テーブルにおける制約の種類まとめ](https://qiita.com/kenji-nishie/items/0e37cd7b2459a7a31cfb)\n\n#### C#\n- Tips\n  - [Visual Studio 2019のC#にて、画像をそのままPDFに変換する。コードのサンプルです。](https://qiita.com/oyk3865b/items/20e1bf40a728671e7647)\n\n#### Android\n- Tips\n  - [Android デバイスを接続して LogCat でログを確認する](https://qiita.com/g_vista/items/382d21f4aae4670bc6cd)\n  - [amazon app store向けにアンドロイドアプリを配信するまで](https://qiita.com/99nyorituryo/items/8422a16691b336cbc809)\n\n#### Swift\n- Summary\n  - [DI(Dependency Injection)優良記事まとめ(Swift)](https://qiita.com/jbnkk40/items/5c6ff1b155817edb507a)\n- Apps\n  - [[Swift/ARKit2] 動くポスターを1時間でつくろう](https://qiita.com/IZUMIRU/items/3c36f7730aff5e6305c5)\n- Tips\n  - [【Swift】画像内の文字列を検出する](https://qiita.com/ddd503/items/1da38e3014c2507b5489)\n\n#### Flutter\n- Tips\n  - [Flutterアプリのデバッグをする](https://qiita.com/rydein/items/d371d5ef45491c3c5f95)\n\n#### Vue.js\n- Beginner\n  - [Vue.jsの環境構築](https://qiita.com/minuro/items/a7defcb9dbe4ac06856b)\n  - [ソフトウェア危機からオブジェクト指向に至るまで](https://qiita.com/Erika-M/items/a27be2f1c220e7f036a0)\n  - [ASAP Vue SPA入門：Vue の基本](https://qiita.com/tsubo/items/02a18b1899128505682e)\n- Apps\n  - [Vue + AWS Amplifyでシンプルな画像共有アプリを作成する (概要) #1](https://qiita.com/yukitaka13-1110/items/e83256107afafaf7755b)\n\n#### Vuex\n- Tips\n  - [DBをフロントに持てる！Vuex-ORM環境構築と動作確認](https://qiita.com/YaCpotato/items/b51384652659a400a2b9)\n\n#### React\n- Beginner\n  - [Reactをわかった気になる #1 Reactの特徴](https://qiita.com/fiftie/items/37b2212739b29f3e79cc)\n  - [Reactをわかった気になる #2 コンポーネント](https://qiita.com/fiftie/items/6471bbe1d1b081ea8a24)\n- Tips\n  - [Reactアプリにamazon-connect-streamsを組み込む](https://qiita.com/Kazunori-Kimura/items/546f2db361440467dc31)\n\n#### JavaScript\n- Beginner\n  - [javascriptのコールバック関数とは？簡単な実行例と覚書](https://qiita.com/bonoboz/items/5d8753954a524d690c26)\n\n#### Node.js\n- Tips\n  - [GASを使って、スプレッドシート更新時にSlack通知を飛ばしてくれるbotを作ってみた](https://qiita.com/n0bisuke/items/a1b39635029242f31713)\n  - [Node.jsでGoogle Drive上のファイルをリネームする (Google Drive API v3)](https://qiita.com/n0bisuke/items/dcc7be337a555b018b19)\n  - [Node.js - chokidar で CSVファイルの変更検知して deep-diff で差分比較した情報をログ出力する](https://qiita.com/anfangd/items/0c9655cc622379ddc27b)\n\n#### Laravel\n- Beginner\n  - [Cloud9でLaravelプロジェクトをnewするまで](https://qiita.com/yusuke_yasuo/items/fa68d572d511296c2129)\n  - [docker+laravel+VSCode+Xdebugという開発環境を作る](https://qiita.com/kefian1go/items/bbc8f9d51fe890194ad7)\n- Tips\n  - [Laravelでデータベースから検索した値をペジネーションを使って表示させる](https://qiita.com/mukae_tech/items/3c779b229b0d3e673f79)\n\n#### jQuery\n- Tips\n  - [jQueryを使った画像表示方法](https://qiita.com/okdyy75/items/01aac481258a421be0c7)\n\n#### Go言語\n- Beginner\n  - [メソッドの基本](https://qiita.com/panpanman/items/28f846bad34e20fc5f9b)\n\n#### Unity\n- Beginner\n  - [Unityでよく使う実装方法まとめ](https://qiita.com/papyrustaro/items/904702e0c16c3d72df6b)\n\n#### Bot\n- Tips\n  - [LINE botでちょっとしたタスクをメモする](https://qiita.com/koob/items/c4e3bd33b3ff2ae5b61f)\n\n#### HTML\n- Tips\n  - [HTML の 要素 の 角 を 丸めて 表示させる](https://qiita.com/miriwo/items/aa876a218f104330ead3)\n\n#### MySQL\n- Beginner\n  - [MySQLの基本(データベースの操作)3](https://qiita.com/ugajitatsuya/items/359c80df59b4e50e32e2)\n\n#### AI\n- Beginner\n  - [【クラスタリング入門第0回】データ分類の基本 k平均法をJavaで実装してみよう](https://qiita.com/tan3_sugarless/items/15dcc55d1d666437c322)\n\n#### Git\n- Beginner\n  - [図解！ Gitのブランチ・ツリーをちゃんと読む](https://qiita.com/jesus_isao/items/2a0495c973a4c911c2cc)\n- Tips\n  - [gitで管理しているエクセルファイルの差分を確認する](https://qiita.com/e_tyubo/items/80b45996591564013059)\n\n#### Azure\n- Azure AD\n  - [Azure AD で FIDO キーでサインインする2 (WIndows 10 設定～デスクトップ サインイン)](https://qiita.com/murasamelabo/items/8a1bd6f04d71e550c6cf)\n\n#### インフラ\n- 仮想環境\n  - [Vagrantで仮想環境の立て方](https://qiita.com/nnipsii/items/6255d32bec903e89d921)\n- ubuntu\n  - [ubuntu環境構築](https://qiita.com/tommynecessary/items/6de89a1a7a8195b43900)\n\n#### Network\n- Tips\n  - [ネットワークのすべてのアドレスを列挙する](https://qiita.com/hiratarich/items/c30fd8d58a78f42af149)\n\n#### RPA\n- Apps\n  - [しりとりゲームで人が無意識に行っていること～RPAで一人しりとりロボットを開発してみる～](https://qiita.com/n_oshiumi/items/71715a548e9da3b2b355)\n\n#### Docker\n- Beginner\n  - [自分用メモ：はじめてDockerを使う](https://qiita.com/nekotarolu/items/7799ad0d6831df736175)\n\n#### Linux\n- Tips\n  - [Linuxのマルチスレッドプログラミングにおけるスタックサイズの設定について](https://qiita.com/tell/items/9eed6bde9de4e8f6fd15)\n\n#### Google Apps Script\n- Beginner\n  - [GASで「Hello,World!」を出力するまでをまとめてみた。](https://qiita.com/ta9star/items/fae274689334f8836a80)\n- Tips\n  - [GASによるSpreadsheetの基本操作まとめ](https://qiita.com/mitama/items/e5fbf8306384c26cf42f)\n  - [【GAS】スプレッドシートから書式も含めて他のスプレッドシートへコピーする方法](https://qiita.com/plumfield56/items/704c1169071b7116b20e)\n- Apps\n  - [GASを使って、スプレッドシート更新時にSlack通知を飛ばしてくれるbotを作ってみた](https://qiita.com/matsukazu1112/items/d47e81d4c4d08d2147d3)\n\n#### Server Side\n- Tips\n  - [【Postman】Getメソッドで配列を渡す時にどう書くか](https://qiita.com/yama-t/items/a4f940ecd7d79f27232a)\n\n#### Develop\n- Tips\n  - [【PowerApps Tip's】開発言語経験者の多くが陥る最初の罠と回避方法](https://qiita.com/yamad365/items/feed918f9934ee6a2f07)\n- Coding\n  - [言語規格、コーディング標準の使い方](https://qiita.com/kaizen_nagoya/items/01256365b82666e101aa)\n\n#### PowerShell\n- Tips\n  - [複数のファイルのタイムスタンプを 一括で変更するためのPowerShellスクリプト](https://qiita.com/X-IA/items/9d15bef900e5d5cd9c0e)\n  - [複数のファイルを 右クリックからファイル単位で圧縮するバッチ](https://qiita.com/X-IA/items/dd80daccee6d56663ee2)\n\n#### Vim\n- Beginner\n  - [個人的なVim入門](https://qiita.com/ysuzuki19/items/778510d66d883c400740)\n\n#### UML\n- PlantUML\n  - [PlantUMLめも](https://qiita.com/zakki/items/9fcd3b729825eac15951)\n\n#### Raspberry\n- Tips\n  - [Raspberry Pi 3 Model B+とlircを使ってリモコンをコントロールする 1](https://qiita.com/s_ponta/items/0ad51f3642de4bad1a62)\n\n#### Security\n- SSL\n  - [SSLの学習](https://qiita.com/kero3/items/b0528e93be00603ac893)\n\n#### 資格\n- AWS\n  - [AWS ソーリューションアーキテクト プロフェッショナルに合格するまでの4万円と1ヶ月とSnowball](https://qiita.com/nishinoshake/items/cc761fad1dbfc348ce5f)\n  - [約3週間でAWS ソリューションアーキテクト アソシエイトに合格した話](https://qiita.com/GoooglSensei/items/bb07705b35708751f6f3)\n- 基本情報\n  - [基本情報技術者 コンピューターで扱うデータ](https://qiita.com/takahashi1987/items/c8a30d6526389dac57f7)\n- ネットワーク\n  - [ネットワークスペシャリスト試験 合格体験記](https://qiita.com/kuwana-kb/items/5a8474894f47c3c4186d)\n\n## 更新情報\n\n- Kotlin\n  - Kotlin入門\n     - [第1章 はじめてのKotlinアプリケーション](https://qiita.com/promari/items/4d802f3419bdeb46ab61)\n     - [第2章 Kotlinの文法](https://qiita.com/promari/items/e1c88aa8c02b82358a9d) 【New】\n\n- Java\n  - Java 10\n      - [【Java】Java 10で拡張された型推論について注意すべきこと](https://qiita.com/promari/items/a5bb8d1174b3ca8c9426) 【New】\n\n- IDE\n  - IntelliJ IDEA\n      - [【開発環境】ローカル環境への統合開発環境(IDE): IntelliJ IDEAのインストール手順](https://qiita.com/promari/items/fee4599ec3a02a77aeac)\n      - [【開発環境】統合開発環境(IDE) IntelliJ IDEAの日本語化とカスタマイズ](https://qiita.com/promari/items/b6df8db4fb24c5e0b586)\n      - [【開発環境】【IntelliJ IDEA】LiveEditを使ってHTML/CSSを動的に反映させる。](https://qiita.com/drafts/ea1c127cca85cc62f4d0) 【New】\n",
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      "author": "promari",
      "permlink": "puhmko",
      "title": "",
      "body": "お鍋は意外とオールシーズンいけますよね^^",
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      "author": "promari",
      "permlink": "puhmk6",
      "title": "",
      "body": "thank you",
      "json_metadata": "{\"tags\":[\"tasteem\"],\"app\":\"steemit/0.1\"}"
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      "body": "ありがとうございます。",
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      "author": "promari",
      "permlink": "kotlin-kotlin-lesson-vol-4-kotlin",
      "title": "【Kotlin】Kotlin Lesson Vol.4 - Kotlinの文法：データ型",
      "body": "![k5l5kz0qw9.png](https://img.esteem.ws/k5l5kz0qw9.png)\n\n# はじめに\n\n前回は、はじめてのKotlinの文法：変数について学習しました。今回はKotlinの文法：関数ついて説明していきます。以下は前回までの記事です。\n\n- [第1章 はじめてのKotlinアプリケーション](https://qiita.com/promari/items/4d802f3419bdeb46ab61#%E7%AC%AC1%E7%AB%A0-%E3%81%AF%E3%81%98%E3%82%81%E3%81%A6%E3%81%AEkotlin%E3%82%A2%E3%83%97%E3%83%AA%E3%82%B7%E3%83%A7%E3%83%B3)\n   - [1.1 開発環境の構築](https://qiita.com/promari/items/4d802f3419bdeb46ab61#11-%E9%96%8B%E7%99%BA%E7%92%B0%E5%A2%83%E3%81%AE%E6%A7%8B%E7%AF%89) \n   - [1.2 Kotlinプロジェクトの作成](https://qiita.com/promari/items/4d802f3419bdeb46ab61#12-kotlin%E3%83%97%E3%83%AD%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%81%AE%E4%BD%9C%E6%88%90)\n   - [1.3 Kotlinプログラムの作成](https://qiita.com/promari/items/4d802f3419bdeb46ab61#13-kotlin%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%A0%E3%81%AE%E4%BD%9C%E6%88%90)\n  \n- [第2章 Kotlinの文法](https://qiita.com/promari/items/e1c88aa8c02b82358a9d#%E7%AC%AC2%E7%AB%A0kotlin%E3%81%AE%E6%96%87%E6%B3%95)\n  - [2.1 変数](https://qiita.com/promari/items/e1c88aa8c02b82358a9d#21-%E5%A4%89%E6%95%B0) \n  - [2.2 関数](https://qiita.com/promari/items/e1c88aa8c02b82358a9d#22-%E9%96%A2%E6%95%B0 \n\n# 第2章：Kotlinの文法\n\n## 2.1 変数\n\n  - [2.1 変数](https://qiita.com/promari/items/e1c88aa8c02b82358a9d#21-%E5%A4%89%E6%95%B0)を参照してください。 \n  \n## 2.2 関数\n\n  - [2.2 関数](https://qiita.com/promari/items/e1c88aa8c02b82358a9d#22-%E9%96%A2%E6%95%B0)を参照してください。 \n\n## 2.3 データ型\n\n### 2.3.1 基本型\n\nKotlinは、他の言語と同じようにInt、Double、Boolean、Charなどの型が用意されています。ただし、Javaと違ってプリミティブ型は用意されていません。Int型やBoolean型などすべてがオブジェクトのように動作します。Javaがint、doubleなどに対応するInteger、Doubleなどのラッパー型があるのとは対照的ですね。\n\nただし、オブジェクトだからといってパフォーマンスの懸念はありません。Kotlinは、パフォーマンスを向上させるために、String以外は、実行時にInt、Char、Booleanなどのオブジェクトをプリミティブ型に最適化してくれるからです。\n\n#### 2.3.1.1 数値型(Numbers)\n\nKotlinの数値型はJavaに似ていて、整数型と浮動小数点型に分類できます。\n\n- 整数型(Integers)\n\n|型    |説明                |\n|------|--------------------|\n|Byte  |8ビット符号付き整数 |\n|Short |16ビット符号付き整数|\n|Int   |32ビット符号付き整数|\n|Long  |64ビット符号付き整数|\n\n- 浮動小数点型(Floating Point Numbers)\n\n|型     |説明                |\n|-------|--------------------|\n|Float  |32ビット浮動小数点数|\n|Double |64ビット浮動小数点数|\n\n以下に数値型の例を示します。\n\n```\nval aByte: Byte = 11\nval aShort: Short = 111\n\nval aInt = 1000       // 10進数（型推論の場合）\nval aLong = 1000L     // サフィックスに'L'を付けると、Long型。これでコンパイラは型推論でLong型と推論します。\n\nval aDouble = 126.78  // 浮動小数点はデフォルトでDouble型\nval aFlout = 126.78f  // サフィックスに'f'または'F'を付けると浮動小数点型になります。\n\nval aHex = 0x0AFF     // プレフィックスに'0x'または'0X'を付けると16進数\nval aBinary = 0b1100  // プレフィックスに'0b'または'0B'を付けると2進数\n```\n\n#### 2.3.1.2 論理型(Booleans)\n\n論理型は他の言語と同じ様にtrueとfalseの2つの値を取ります。\n\n```\nval aBoolean = true\nval bBoolean = false\n```\n\n#### 2.3.1.3 文字型(Characters)\n\n文字はChar型を使用します。ただし、注意点があり、Javaとは異なり、Char型は数値としては扱うことはできません。Char型を表すにはシングルクォートを使います。\n\n```\nval aChar = 'A'\nval dChar = '9'\nval lChar = '\\n'\nval uChar = '\\uFF00' // UNICODE\n```\n\n#### 2.3.1.4 文字列型(Strings)\n\n文字列はStringクラスを使って表現されます。文字列型は、Javaと同様にイミュータブルな変数として表されます。\n\n```\nval name = \"tamito0201\"\n```\n\n配列のように[index]を使用して、String内の特定のインデックスにある文字にアクセスできます。\n\n```\nval name = \"tamito0201\"\nval charIndex = name[0]   // 't'\nval lastChar = name[name.length - 1]   // '1'\n\n// 配列なのでループで回すこともできます。\nfor (chr in name) {\n    printn(chr)\n}\n\n// 二重引用符（ダブルクォート）で宣言された文字列は、 '\\ n'（改行）、 '\\ t'（タブ）などのようにエスケープ文字を含むことができます。\nval aEscapedStr = \"Hello tamito0201\\nHow are you?\"\n\n// Kotlinではトリプルクォートを使ってエスケープがない複数行にまたがる文字列を格納できる。\nval aMultilineStr = \"\"\"\nここにかいた文字列は\n改行も含めて、そのままの文字列が出力されます。\n   インデントも。これ便利ですね。\n\"\"\"\n\n// $を使って文字列の中に変数の値や計算結果を埋め込めます。\nval i = 100\navl str = \"i = $i, i ÷ 10 = ${i / 10}\"   // \"i = 10, i ÷ 10 = 10\"\n```\n### 2.3.2 型変換\n\n```\n// 整数の数値代入\nval b: Byte = 1      // IntをByteと見なしてくれる\nval l: Long = 100    // OK\nval i: Int = 1L      // NG。明示的にLongを指定すると代入できない。\nval f: Floug = 3.0   // NG。浮動小数点はデフォルトでDouble型なのでNG。暗黙的な型変換はKotlinには存在しない。\nval d: Double = 3    // NG。整数を浮動小数点とはみなさない。\n\n// 小さな型から大きな型への暗黙的キャストはKotlinではできない\nval a: Byte = 1\nval b: Int = a       // NG。\n\n// 型は以下のように明示的に変換します。\n// IntからLongの型変換\nval aInt = 100\nval aLong = aInt.toLong()\n\n// 大きな型から小さな型への変換\nval doubleValue = 123.45\nval intValue = doubleValue.toInt()   // 123\n\n// Kotlinのすべての型は、Stringに変換するためのtoString()というヘルパー関数をサポートしています。\nval aInt = 1111\naInt.toString()      // \"1000\"\n\n// 文字列から数値型への変換\nval str = \"1111\"\nval intValue  = str.toInt()\n\n//  文字列から数値への変換が不可能な場合\n// str = \"1111AAA\"\nstr.toInt()          // Throws java.lang.NumberFormatException\n```\n\n### 2.3.3 ビット演算\n\nKotlinでは論理演算子、ビット演算子はJavaのように特別な文字（&など）で表現されるわけではありません。関数によりその機能が提供されています。\n\n|Kotlin|Java|説明            |\n|------|----|----------------|\n|shl   |<<  |左シフト        |\n|shr   |>>  |符号付右シフト  |\n|ushr  |>>> |符号なし右シフト|\n|and   |&   |論理積          |\n|or    ||   |論理和          |\n|xor   |^   |排他的論理和    |\n|inv() |~   |ビット反転      |\n\n## おわりに\n\n如何でしょうか。基本型一つにとってもJavaとは異なる点が多いかと思います。こうして新しい言語を学ぶときは基本型に立ち戻り、仕様を比較してみるのもよろしいかと思います。\n\n次回は、Kotlinにおける配列型について説明したいと思います。\n\n[プロマリ](https://www.programming-mariage.jp/)はあなたのエンジニアデビューをサポートします。\n\n![t0r78hqbeu.png](https://img.esteem.ws/t0r78hqbeu.png)\nwritten by [たみと@promari](https://ameblo.jp/promari)\n\nプログラミングとのご縁結びなら[プロマリ](https://www.programming-mariage.jp/)へ。\n\nオンラインプログラミング学習スクールの[プロマリ](https://www.programming-mariage.jp/)は、プログラミングの初学者の皆様を応援しています。プログラミング講師と一緒に面白いアプリを作りませんか。\n\n<a href=\"https://www.programming-mariage.jp\">![btpb5hmlur.png](https://img.esteem.ws/btpb5hmlur.png)</a>\n\nThe programming school \"[Promari](https://www.programming-mariage.jp/)\" will help you learn programming. \"[Promari](https://www.programming-mariage.jp/)\" is supporting the first scholars of programming. Let's develop an application with our programming instructor.",
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      "title": "【Java】Java 10で拡張された型推論について注意すべきこと",
      "body": "![6qwm567z1m.jpg](https://img.esteem.ws/6qwm567z1m.jpg)\n\n[Swift](https://ja.wikipedia.org/wiki/Swift_(%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0%E8%A8%80%E8%AA%9E))や[Scala](https://ja.wikipedia.org/wiki/Scala)、[Kotlin](https://ja.wikipedia.org/wiki/Kotlin)、[Go](https://ja.wikipedia.org/wiki/Go_\\(%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0%E8%A8%80%E8%AA%9E\\))、[Rust](https://ja.wikipedia.org/wiki/Rust_(%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0%E8%A8%80%E8%AA%9E))で開発している方はいわゆる「型推論」を普段使い慣れていることでしょう。型推論は、静的型付け言語における言語機能であり、明示的に型を記述しなくてもコンパイラが自動的に型を決定してくれる機能ですので、Kotlinの型推論のように、\n\n```\nvar a = 1\n```\n\nと記載するだけで、コンパイラが右辺の型から自動的に左辺の変数aが整数型であると推論してくれるわけです。ついにJavaでもJava 10から型推論が導入されたことは記憶に新しい出来事でもありました。\n\nたとえば、Java 10よりも前では以下のように変数の型を明示的に書く必応がありました。\n\n```\nString name = \"tamito0201\";\n```\n\nJava 10 になるとvarキーワードを付けることによって、次のようにローカル変数の宣言で必須の明示的な型を削除することができます。\n\n```\nvar name = \"tamito0201\";\n```\n\n上記の場合は、ただStringがvarに置き換わっただけなので、あまりメリットを感じないかもしれません。しかし、Javaの場合コレクションAPIを使用する際に、うんざりするほど冗長なコードを書かなくてはいけませんよね。\n\n```\nHashMap<Integer, String> map = new HashMap<Integer, String>();\n```\n\nJava10以降ではこれを、\n\n```\nvar map = new HashMap<Integer, String>();\n```\n\nのように記載することができます。なんてエレガントなのでしょう。\n\nただし、型推論は便利な反面思わぬバグを生んでしまう諸刃の剣でもあります。ですので、プロジェクトによってはコーディング規約によりvarの仕様を禁じ、明示的に型を指定するプロジェクトも存在します。大規模プロジェクトになればなるほど、思わぬバグを生むリスクを考えて、旧来通りの明示的な型指定を行うプロジェクトも多いのです。\n\nなぜか？たとえば以下のコードが記述されているとしましょう。\n\n```\nvar distance = getDistance();\nSystem.out.println(distance * 100);\n```\n\n関数getDistanceの戻り値はなんでしょうか。ここで感の鋭い方は気づいたかもしれませんね。そうです。ラッパーオブジェクトであるIntegerを返却する可能性があるのであれば、nullが返ってくることもあります。その結果次の`distance * 100`でヌルポが発生するのは自明ですので、nullチェックを入れる必要があります。\n\n```\nInteger distance = getDistance();\nif (distance != null) {\n    System.out.println(distance * 100);\n}\n```\n\nJava 8以降ではOptionalを返せばよいですね。\n\n```\nOptional<Integer> distance = Optional.ofNullable(getDistance());\ndistance.ifPresent(d -> System.out.println(d * 100));\n```\n\nつまりそのプロジェクトやチームでvarを使いわけるため、コーディング指針を決めておく必要があります。\n\n- varを使わない\n- ローカル変数は原則varを使用する。\n- 右辺に明示的な型が指定されている場合のみvarを使用する\n- コーディング規約で明示する型を決めてそれ以外はvarを使う\n- 単体テストでカバーするためプロジェクトではvarを使用する\n\nどれも正解ですが、現実的には1 or 2が妥当であると考えられます。コーディング規約でいくら明示する型を指定しても大規模プロジェクトでは、コーディング規約をすべてのエンジニアが遵守できるなんて到底考えられませんからね。コーディング規約で決めて、[Checkstyle](https://ja.wikipedia.org/wiki/Checkstyle)や[SpotBugs](https://spotbugs.github.io/)、[PMD](https://pmd.github.io/)等でしばっておいたほうがいいかと思います。\n\n何事にもメリット、デメリットはあります。\n\nこの辺りは、プロジェクトでどうするか必ず決めておいて下さい。決めないと出来上がったプロジェクトのソースはカオスになってしまいますからね。\n\n[プロマリ](https://www.programming-mariage.jp/)はあなたのエンジニアデビューをサポートします。\n\n![t0r78hqbeu.png](https://img.esteem.ws/t0r78hqbeu.png)\nwritten by [たみと@promari](https://ameblo.jp/promari)\n\nプログラミングとのご縁結びなら[プロマリ](https://www.programming-mariage.jp/)へ。\n\nオンラインプログラミング学習スクールの[プロマリ](https://www.programming-mariage.jp/)は、プログラミングの初学者の皆様を応援しています。プログラミング講師と一緒に面白いアプリを作りませんか。\n\n<a href=\"https://www.programming-mariage.jp\">![btpb5hmlur.png](https://img.esteem.ws/btpb5hmlur.png)</a>\n\nThe programming school \"[Promari](https://www.programming-mariage.jp/)\" will help you learn programming. \"[Promari](https://www.programming-mariage.jp/)\" is supporting the first scholars of programming. Let's develop an application with our programming instructor.\n",
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