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Showing content from http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean/valueOf below:

Boolean.prototype.valueOf() - JavaScript | MDN

Boolean.prototype.valueOf()

Baseline Widely available

The valueOf() method of Boolean values returns the primitive value of a Boolean object.

Try it
const x = new Boolean();

console.log(x.valueOf());
// Expected output: false

const y = new Boolean("Mozilla");

console.log(y.valueOf());
// Expected output: true
Syntax Parameters

None.

Return value

The primitive value of the given Boolean object.

Description

The valueOf() method of Boolean returns the primitive value of a Boolean object or literal Boolean as a Boolean data type.

This method is usually called internally by JavaScript and not explicitly in code.

Examples Using valueOf()
const x = new Boolean();
const myVar = x.valueOf(); // assigns false to myVar
Specifications Browser compatibility See also

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