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

左シフト代入 (<<=) - JavaScript | MDN

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左シフト代入演算子 (<<=) は、指定された数だけビットを左に移動し、結果を変数に代入します。

let a = 5; // 00000000000000000000000000000101

a <<= 2; // 00000000000000000000000000010100

console.log(a);
// Expected output: 20

let a = 5;
// 00000000000000000000000000000101

a <<= 2; // 20
// 00000000000000000000000000010100

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