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빼기 할당 (-=) - JavaScript | MDN

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빼기 할당 (-=)

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015년 7월.

빼기 할당 연산자(-=)는 오른쪽 피연산자의 값을 변수에서 뺀 결과를 다시 변수에 할당합니다.

시도해 보기

let a = 2;

console.log((a -= 3));
// Expected output: -1

console.log((a -= "Hello"));
// Expected output: NaN

구문

js
x -= y; // x = x - y

예제

빼기 할당 사용하기

js
// bar = 5
// 위와 같은 변수를 가정할 때

bar -= 2; // 3
bar -= "foo"; // NaN

명세

Specification
ECMAScript® 2026 Language Specification
# sec-assignment-operators

브라우저 호환성

같이 보기









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