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The toString() method in JavaScript is used to convert an object to a string representation. This method does not take any arguments, and returns a string representation of the object on which the toString() method was called.

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

const array1 = ['Hello', 'world!'];

const result = array1.toString();

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

In the code example above, we first declare an array called array1 that contains the two strings Hello and world!. We then use the toString() method to convert the array1 array to a string representation. The toString() method does not take any arguments, so we simply call the method on the array1 array without passing any arguments.

As a result of calling the toString() method, the result variable will be set to 'Hello,world!', which is a string representation of the array1 array. The toString() method converts each element of the array to a string, and separates the strings with a comma.