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ビット排他的論理和代入 (^=) - JavaScript | MDN

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ビット排他的論理和代入演算子 (^=) は、両方のオペランドの二進表現を使用し、それらに対してビット単位の XOR 演算を実行し、結果を変数に代入します。

let a = 5; // 00000000000000000000000000000101
a ^= 3; // 00000000000000000000000000000011

console.log(a); // 00000000000000000000000000000110
// Expected output: 6

let a = 5; // 00000000000000000000000000000101
a ^= 3; // 00000000000000000000000000000011

console.log(a); // 00000000000000000000000000000110
// 6

let b = 5; // 00000000000000000000000000000101
b ^= 0; // 00000000000000000000000000000000

console.log(b); // 00000000000000000000000000000101
// 5

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