intro_to_flutter.dart

// Basics of dart

// Hello World

void main(){
  print('Hello World!');
}

// Variables

void main(){
  var lName= 'Smith';
  String fName= 'Henry';
  int num=10;
  
  print(fName.runtimeType);
  print(lName.runtimeType);
  print(num.runtimeType);
}

// Functions

bool isNotZero(int number){
  return number != 0;  
}

bool isZero(int number) => number == 0;

void main(){
  print(isNotZero(0));
  print(isZero(0));
}

// Classes

class Car {
   String engine = "E1001";  
   
   void disp() { 
      print(engine); 
   } 
}

void main() { 
   Car c = new Car(); 
   c.disp(); 
}  


// Flutter Hello World

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
      title: "My App",
      home: Scaffold(
          appBar: AppBar(title: Text("Hello World Application")),
          body: Center(child: Text("Hello World!")))));
}

// States in Flutter

// Dartpad link: https://dartpad.dev/b6409e10de32b280b8938aa75364fa7b

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}

// Fiddling more with states Dartpad: https://dartpad.dev/40308e0a5f47acba46ba62f4d8be2bf4

// Thanks for attending!