Promise.prototype.finally
Read Originalこの記事は、TC39 stage 3 となった Promise.prototype.finally の仕様と実用例を詳しく説明しています。非同期処理（fetchなど）において、成功(resolve)・失敗(reject)のどちらでも実行すべき共通処理（スピナーの非表示など）を、.then() と .catch() の両方に書く必要がなくなり、.finally() 一つで簡潔に記述できる方法を、コード例と動作デモを交えて紹介しています。
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