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The toLocaleLowerCase() method in JavaScript is used to convert all the characters in a string to their lowercase equivalent, according to the rules of the current locale. This method does not take any arguments, and returns a new string with all the characters in the original string converted to lowercase.

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

const string1 = 'Hello, world!';

const result = string1.toLocaleLowerCase();

// 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 toLocaleLowerCase() method to convert all the characters in the string1 string to their lowercase equivalent. The toLocaleLowerCase() 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 toLocaleLowerCase() method, the result variable will be set to 'hello, world!', which is the string1 string with all the characters converted to lowercase according to the rules of the current locale. If the string1 string did not contain any uppercase characters, the result variable would be set to the original string1 string.