Returns a new string with the uppercase transformation of the original string, according to the locale case mappings.

The first parameter represents the locale, but it’s optional (and if omitted, the current locale is used):

'Testing'.toLocaleUpperCase() //'TESTING'
'Testing'.toLocaleUpperCase('it') //'TESTING'
'Testing'.toLocaleUpperCase('tr') //'TESTİNG'

Similar to the toUpperCase() method, except that does not take locales into consideration.


Download my free JavaScript Beginner's Handbook!


Check out my in-depth, practical Web Development Courses!

(all 50% off with the coupon code POSITIVEVIBRATIONS)

⤴️⤴️⤴️

And signup to my upcoming JavaScript Bootcamp!

⤴️⤴️⤴️