Dart capitaliza a primeira letra de cada palavra
extension CapExtension on String {
String get inCaps => '${this[0].toUpperCase()}${this.substring(1)}';
String get allInCaps => this.toUpperCase();
String get capitalizeFirstofEach => this.split(" ").map((str) => str.capitalize).join(" ");
}
final helloWorld = 'hello world'.inCaps; // 'Hello world'
final helloWorld = 'hello world'.allInCaps; // 'HELLO WORLD'
final helloWorld = 'hello world'.capitalizeFirstofEach; // 'Hello World'
DevPedrada