Dart Lang : Extend String to be able to parse "true" | "false" to boolean

main.dart

void main() { 

String  trueString = "true";
String  falseString = "false";
  
  if (!falseString.parseBool()) { print("falseString is:false");}  
  if (trueString.parseBool()) { print("trueString is: true");}
} 


extension BoolParsing on String {
  bool parseBool() {
    if (toLowerCase().trimLeft().trimRight() == 'true') {
      return true;
    } else if (toLowerCase().trimLeft().trimRight() == 'false') {
      return false;
    }
    throw '"$this" can not be parsed to boolean.';
  }
}