Question

How to check if the first character of a string is uppercase in Dart

Answer 1

void main() {
    var str = "Dart";

    if (str[0].toUpperCase() == str[0]) {
        print("The first character is uppercase");
    } else {
        print("The first character is not uppercase");
    }
}




/*
run:

The first character is uppercase

*/

 

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Answer 2

bool isFirstCharacterUpperCase(String str) {
    if (str == null || str.isEmpty || str.trimLeft().isEmpty) {
        return false;
    }

    String firstChar = str.trimLeft().substring(0, 1);
    if (double.tryParse(firstChar) != null) {
        return false;
    }
    
    return firstChar.toUpperCase() == str.substring(0, 1);      
}

void main() {
    var str = "Dart";

    if (isFirstCharacterUpperCase(str)) {
        print("The first character is uppercase");
    } else {
        print("The first character is not uppercase");
    }
}





/*
run:

The first character is uppercase

*/

 

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