左シフト代入演算子 (<<=) は、指定された量のビットを左に移動し、結果を変数に代入します。
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構文
Operator: x <<= y Meaning: x = x << y
例
左シフト代入の使用
let a = 5;
// 00000000000000000000000000000101
bar <<= 2; // 20
// 00000000000000000000000000010100仕様
ブラウザー実装状況
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