flutter – Text capitalize first letter

main.dart

import 'package:flutter/material.dart';

void main(){
  var txt = "i am a text.";

  runApp(
      MaterialApp(
        home: Scaffold(
          appBar: AppBar(
              title: const Text(
                  "Flutter - Text Capitalize First Letter"
              )
          ),
          body: Container(
              alignment: Alignment.center,
              padding: const EdgeInsets.all(8),
              child: Text(
                  "${txt[0].toUpperCase()}${txt.substring(1)}",
                  style: const TextStyle(fontSize: 50)
              )
          ),
        ),
      )
  );
}

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