The String toUpperCase() method
Find out all about the JavaScript toUpperCase() method of a string
Return a new string with the text all in upper case.
Does not mutate the original string.
Does not accept any parameter.
Usage:
'Testing'.toUpperCase() //'TESTING'
If you pass an empty string, it returns an empty string.
It’s similar to toLocaleUpperCase(), but does not consider locales at all.
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