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Showing content from https://developer.cdn.mozilla.net/ko/docs/Web/JavaScript/Reference/Global_Objects/Number/valueOf below:

Number.prototype.valueOf() - JavaScript | MDN

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valueOf() 메서드는 Number 객체가 감싼(wrapped) 원시 값을 반환합니다.

const numObj = new Number(42);
console.log(typeof numObj);
// Expected output: "object"

const num = numObj.valueOf();
console.log(num);
// Expected output: 42

console.log(typeof num);
// Expected output: "number"

Number 객체의 원시 값.

valueOf() 메서드는 보통 JavaScript에 의해 내부적으로 호출되고, 웹 코드에서는 명시적으로 호출하지 않습니다.

var numObj = new Number(10);
console.log(typeof numObj); // object

var num = numObj.valueOf();
console.log(num); // 10
console.log(typeof num); // number

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