JavaScriptの変数の基本を初心者向けにわかりやすく解説し、var・let・constの違いとそれぞれの役割を整理します。スコープや再代入の可否など、なぜ3種類の変数が存在するのかも実践的に理解できる内容です。現役エンジニアの視点から、つまずきやすいポイントを丁寧に解説します。

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