tailorvj

main() {
  var dividesBy2 = <int>{2,4,6,8,10,12,14,16,18,20};
  var dividesBy3 = <int>{3,6,9,12,15,18,21};

  var dividesBy6 = dividesBy2.intersection(dividesBy3);
  print('dividesBy6: $dividesBy6\n');

  var doesntDivideBy6 = dividesBy2.difference(dividesBy3);
  print('doesntDivideBy6: $doesntDivideBy6\n');
  

tailorvj

main() {
  Set<String> nameSet = {'Rita', 'Alex', 'Sam', 'Eva'};
  print('nameSet: $nameSet\n'); //{Rita, Alex, Sam, Eva}
  
  List<String> nameList = nameSet.toList();
  print('nameList: $nameList\n'); //[Rita, Alex, Sam, Eva]
  
  Set<String> nameSet2 = nameList.toSet();
  print('nameSet2: $nameSet2\n'); //{Rita, Alex, Sam, Eva}
}

tailorvj

main() {
  Set<String> nameSet = {'Rita', 'Alex', 'Sam', 'Eva'};

  print('nameSet.contains(\'Sam\'): ${nameSet.contains('Sam')}\n');
  
  nameSet.forEach((element){
    print('element: $element');
  });
  
  nameSet.clear();

tailorvj

main() {
  Set<String> names = {'Rita', 'Alex', 'Sam', 'Eva'};
  var persons = <String>{}; //inferred type Set

  print('persons: $persons');
  print('persons.length is ${persons.length}');
  print('persons Type is ${persons.runtimeType}\n');

  print('names: $names');
  print('names.length is ${names.length}');

tailorvj

main() {
  Map map = {
    'key1': 'value1',
    'key2': 'value2',
    'key3': 'value3'
  };
 
  print('map.length is ${map.length}');
  print('map: $map');
  print('map[\'key1\'] is ${map['key1']}');

tailorvj

main() {
  List list = [1,'two',3,'four'];
 
  print('list.length is ${list.length}');

  print('list: $list');
  print('list index 1 value: ${list[1]}');
  print('list index 0 value: ${list[0]}\n');
  
  print('Adding 10 to the end of the list');

tailorvj

main() {
  var theNumber = 42;
  const PI = 3.14159;
  var theText = 'Hello World!';
  var learningDart = true;
  
  print('theNumber is type ${theNumber.runtimeType}');
  print('PI is type ${PI.runtimeType}');
  print('theText is type ${theText.runtimeType}');
  print('learningDart is type ${learningDart.runtimeType}');

tailorvj

main() {
  StringBuffer sb = new StringBuffer('initial_content');

  print('sb.length is ${sb.length}');
  print('${sb.toString()}\n');
  
  sb.write("_Hello");
  sb.writeAll(['_space', '_and', '_more']);
 
  print('sb.length is ${sb.length}');

tailorvj

void main(){ 
    print("App started"); 
    App(); //no need to use the new keyword in Dart
    print("App finished"); 
} 

class App{ 
    App(){ 
        print("Constructing a class."); 
    }

tailorvj

import firebase from 'firebase/app';
import 'firebase/firestore';

const firebaseConfig = firebase.initializeApp({
//create a Firestore database in your Firebase project and 
//replace only the internal part of this object from your Firebase web settings
    apiKey: "",
    authDomain: "your.firebaseapp.com",
    databaseURL: "https://your.firebaseio.com",
    projectId: "yourprojectid",