Variables and Built-in types in Dart

variables-and-inbuilt-types.dart

void main() {
  // Variables and constants
  var edition = 2;
  int year = 2011;
  const language = 'Dart';
  String name; // == null
  
  // Number
  var num1 = 5;
  var num2 = 10.0;
  
  print(num1 * num2);
  print(num1 / num2);
  print(num1 + num2);
  print(num1 - num2);

  // String
  var str1 = 'Lorem ';
  String str2 = 'ipsum ';
  var str3 = str1 + str2 + 'dolor';
  var str4 = 'Lorem '
    'ipsum $str1'  // String interpolation
    r'amet $str2'; // Raw strings
  
  print(str4);
  
  // Boolean
  bool isBrowser = true;
  var isInvisible = false;
  
  print(isBrowser);
  print(isInvisible);
  
  // Function
  sum(int a, int b) {
    return a + b;
  }
  print(sum(5, 10));
  
  var foo = (a) => print('bar $a');
  foo('baz');
  
  // List
  List fruits = ['banana', 'pineapple', 'mango'];
  print(fruits.length);
  fruits.forEach((fruit) => print("I'd like a $fruit"));
  
  // Map
  var user = {
    "name": 'Sam',
    "age": 25,
    "isSubscriber": true,
  };
  print(user["name"]); // Array syntax used as key is not an object property
  
  // Runes
  Runes input = new Runes('I \u2665 Dart');
  print(new String.fromCharCodes(input));
  
  // Symbol
  Symbol simb = #bar;
 	print(simb);
}

Try this snippet in DartPad.