JavaScript Reference: String toUpperCase() method

Find out all about the JavaScript toUpperCase() method of a string

Published Mar 08, 2019

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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.