toUpperCase method
Converts all characters in this string to upper case.
If the string is already in all upper case, this method returns this
.
'alphabet'.toUpperCase(); // 'ALPHABET' 'ABC'.toUpperCase(); // 'ABC'
This function uses the language independent Unicode mapping and thus only works in some languages.
Implementation
// TODO(floitsch): document better. (See EcmaScript for description). String toUpperCase();
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https://api.dart.dev/stable/2.13.0/dart-core/String/toUpperCase.html