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

右シフト代入 (>>=) - JavaScript | MDN

Baseline Widely available

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

let a = 5; //  00000000000000000000000000000101

a >>= 2; //  00000000000000000000000000000001
console.log(a);
// Expected output: 1

let b = -5; //  11111111111111111111111111111011

b >>= 2; //  11111111111111111111111111111110
console.log(b);
// Expected output: -2

let a = 5; // (00000000000000000000000000000101)
a >>= 2; // 1 (00000000000000000000000000000001)

let b = -5; // (-00000000000000000000000000000101)
b >>= 2; // -2 (-00000000000000000000000000000010)

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