べき乗代入 (**=)

べき乗代入演算子 (**=) は、変数の値を右辺のオペランドでべき乗します。

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Operator: x **= y
Meaning:  x  = x ** y

// 次の変数を想定
//  bar = 5

bar **= 2     // 25
bar **= 'foo' // NaN

• Assignment operators in the JS guide
• Exponentiation operator