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The valueOf() method in JavaScript is used to return the primitive value of a string object. This method does not take any arguments, and simply returns the primitive value of the string on which the valueOf() method was called.

Here is an example of how the valueOf() method works:

const string1 = 'Hello, world!';

const result = string1.valueOf();

// the result will be: 'Hello, world!'

In the code example above, we first declare a string called string1 that contains the text Hello, world!. We then use the valueOf() method to get the primitive value of the string1 string. The valueOf() method does not take any arguments, so we simply call the method on the string1 string without passing any arguments.

As a result of calling the valueOf() method, the result variable will be set to 'Hello, world!', which is the primitive value of the string1 string. This is the same value that is stored in the string1 string, so calling the valueOf() method on a string simply returns the original string value.