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Reactプロジェクトの作成と実行

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#1 事前準備

  • npmのインストール
  • yarnのインストール

#2 プロジェクトの作成

  • 任意のフォルダでコマンド実行
npx create-react-app react-app 

#3 プロジェクトの実行

  • 作成されたプロジェクトのフォルダに移動して、コマンド実行
cd react-app
yarn start
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