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Showing content from http://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Exponentiation_assignment below:

べき乗代入 (**=) - JavaScript | MDN

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べき乗代入演算子 (**=) は、変数の値を右オペランドでべき乗します。

let a = 3;

console.log((a **= 2));
// Expected output: 9

console.log((a **= 0));
// Expected output: 1

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

js

x **= y; // x = x ** y

js

// 次の変数を想定
//  bar = 5

bar **= 2; // 25
bar **= "foo"; // NaN

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