how to make first letter of a string capital in flutter code example

Example 1: flutter to capital letter

'alphabet'.toUpperCase(); // 'ALPHABET'
'ABC'.toUpperCase();      // 'ABC'

Example 2: first letter capital flutter

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(" ");
}