import 'package:flutter/material.dart';

MaterialApp(
   ThemeData(
        name: "Majid Hajian",
        location: "Oslo, Norway",
        description: '''
        	Flutter Google Developer Expert, 
	        Community Leader, Author and international Speaker
         ''',
        main: "Flutter/Dart, PWA, Performance",
        homepage: "https://www.majidhajian.com",
        socials: {
          twitter: "https://www.twitter.com/mhadaily",
          github: "https://www.github.com/mhadaily"
        },
        author: {
          Pluralsight: "www.pluralsight.com/authors/majid-hajian",
          Apress: "Progressive Web App with Angular, Book",
          PacktPub: "PWA development, 7 hours video course",
          Udemy: "PWA development, 7 hours video course",
        }
        devDependencies: {
          tea: "Ginger", 
          mac: "10.14+",
        },
        community: {
          MobileEraConference: "Orginizer",
          FlutterVikings: "Orginizer", 
          FlutterDartOslo: "Orginizer",
          GDGOslo: "Co-Orginizer",
          DevFestNorway: "Orginizer",
          ...more
        }));

> flutter channel
Flutter channels:
  master
  dev
  beta
* stable

flutter create --org com.majidhajian startwithflutter // create project

flutter upgrade // check latest sdk 

flutter doctor // check if evreything is fine

Running "flutter pub get" in startwithflutter...                    1.8s
All done!
.
├── README.md
├── android
│   ├── app
│   ├── build.gradle
│   ├── gradle
│   ├── gradle.properties
│   ├── gradlew
│   ├── gradlew.bat
│   ├── local.properties
│   ├── settings.gradle
│   └── startwithflutter_android.iml
├── ios
│   ├── Flutter
│   ├── Runner
│   ├── Runner.xcodeproj
│   └── Runner.xcworkspace
├── lib
│   └── main.dart
├── pubspec.lock
├── pubspec.yaml
├── startwithflutter.iml
└── test
    └── widget_test.dart

10 directories, 13 files

// pubspec.yaml

name: startwithflutter
description: A new Flutter project.

version: 1.0.0+1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^0.1.3

dev_dependencies:
  flutter_test:
    sdk: flutter
    
    
    // RUN flutter pub get

num testnum  = 12;
int int2 = 1;
var x = 1;
double aDouble = 123.32;
String something = '12';
bool isTrue = true;
List<String> aList = ['a', 'b'];
Map<String, dynamic> aMap = {'s': 'v', 'd': 1};

String s2 = ''' You can do multilines 

				if you do like this 
                
                this works in Dart
             ''';
             
             

var myName = 'Majid';
String s3 = 'my name is $s3';
String s3 = 'my name is ${s3.toUpperCase()}';

bool hasValue = true;

if(hasValue) {
	print('True');
}

var name = 'Majid';

if(name) {
	print('There is a name!');
}

var list = [1,2,3];
assert(list.length == 3); assert(list[1] == 2);
List<String> names = ['majid', 'hajian'];

var list = List(2);
list[0] = 2;
list[1] = 2;       print(list); // [2,2];

var list2 = List();
list.add(1); 
list.add(1); 

void printName(String name){
	print('The name is $name');
}
// omitting types is ok!
printName(String name){
	print('The name is $name');
}

String printNameToFirstLetter(String name){
	print('The name is $name');	
    return name[0];
}

// Fat arrow syntax
String printNameToFirstLetter(String name) => name[0];

// Functions are first-class object, 
['Majid','Hajian'].forEach(printName);

// Named parameters
someFunction({bool isBold: false, String name: ""}) {
 //...   
}
someFunction(isBold: true);

someFunction({bool isBold: false, @required String name}) {
    
}
someFunction(isBold: true, name: 'Majid');

class SomeClassName {
    SomeClassName({this.isBold});
    bool isBold;
}
SomeClassName(isBold: true);

// Positional parameters
someFunction(bool isBold, [String name]) {
 //...   
	if(name != null){}
}
someFunction(true);

someFunction(bool isBold, [String name]) {
 //...   
 	if(name != null){}
}
someFunction(true, 'Majid');

// Type Test `as`, `is, `is!`

Object obj = Person("");

if (obj is Person){
   obj.firstName = 'Majid';
}
// shortway
(obj as Person).firstName = 'Majid';

// Loop

for (var i = 0; i<3; i++) {

}

for (var x in collection) {

}

// Iterable
[].forEach((c)=> print(c));
[].map() // and more

// All dart exceptions are unchecked exceptions

try {

	throw Exception('what?!')
 
} on SocketException {

// handle a specific exception

} catch(e){

// no specificed, handle everything

} finally {
	// clean up tasks
}

class Person {
	// if class produces objects that never changes, 
	const Person({this.firstName});
    // another named constructor with inializer list
    factory Person.fromJson(Map<String, dynamic> json) {
      return Person(firstName: json['name'],);
    }
    // variable must be final if const constructor
    final String firstName;
    void printName() {
    	print(firstName);
    }
}
class SomePerson extends Person{
	@override
    printName(){}
}
// abstract and generics
asbtract class Something<T>{}