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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構文
Operator: x **= y Meaning: x = x ** y
例
べき乗代入の仕様
// 次の変数を想定
// bar = 5
bar **= 2 // 25
bar **= 'foo' // NaN
仕様
ブラウザー実装状況
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