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Showing content from https://developer.cdn.mozilla.net/ko/docs/Web/JavaScript/Reference/Operators/Left_shift_assignment below:

왼쪽 시프트 í• ë‹¹ 연산자 (<<=) - JavaScript

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왼쪽 시프트 할당 (<<=) 연산자는 지정된 비트 수 만큼 왼쪽으로 비트를 이동시키고 ê·¸ 결과를 변수에 반영합니다.

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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