This method is used to convert the characters within a string to uppercase while respecting the current locale. For most languages, it returns the same output as toUpperCase.
Returns a string in uppercase with the current locale.
var str = "Apples are round, and Apples are Juicy."; console.log(str.toLocaleUpperCase( ));
Its output is as follows −
APPLES ARE ROUND, AND APPLES ARE JUICY.