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剰余代入 (%=) - JavaScript | MDN

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剰余代入演算子 (%=) は、変数を右辺のオペランドの値で除算し、剰余を変数に代入します。

let a = 3;

console.log((a %= 2));
// Expected output: 1

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

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

// 以下の変数を想定
//  bar = 5

bar %= 2; // 1
bar %= "foo"; // NaN
bar %= 0; // NaN

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