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除算代入 (/=) - JavaScript | MDN

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除算代入演算子 (/=) は変数を右オペランドの値で除算し、結果をその変数に代入します。

let a = 3;

a /= 2;
console.log(a);
// Expected output: 1.5

a /= 0;
console.log(a);
// Expected output: Infinity

a /= "hello";
console.log(a);
// Expected output: NaN

// 以下の変数があり、すべての演算がこの順に実行されると想定する
//  bar = 5

bar /= 2; // 2.5
bar /= 2; // 1.25
bar /= 0; // Infinity
bar /= "foo"; // NaN

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