dart_built_in_types.dart

dart_built_in_types.dart

void main() {
  // dynamic can take any type
  dynamic dy1 = 'Text';
  dy1 = 2;
  
  
   // String type
  String s1 = 'Hello';
  String s2 = "World";
  String s3 = '''
Multi-line
string
''';
  String s4 = 'String concatenation ' + s1 + s2; 
  String s5 = 'String interpolation $s1 ${'My' + s2}';

  
  // runes (for expressing Unicode characters in a string)
  var clapping = '\u{1f44f}';
  

  // Boolean
  bool b = true; 
  b = false;
  b = null;
  bool b2; // variable of any without initialization will be null

  
  // int // double
  var i = 1; // int decimal based on 10, 64 bits or 32 bits (for JS)
  int hex = 0xDEADBEEF; // int
  double d = 1.2; // floating-point numbers, 64 bits or 32 bits (for JS)
  var d1 = 1.42e5; // exponents format
  
  // int and double are subtypes of num
  
  String binary = '10100'; // binary base-2
  int decFromBinaryValue = int.parse(binary, radix: 2);
  
  String oct = '10'; // octal base-8
  int decFromOctValue = int.parse(oct, radix: 8);
  
  String hexStr = '10'; //  hexadecimal base-16
  int decFromHexValue = int.parse(hexStr, radix: 16);
  
  int decvalue = 20; //
  print('dec $decvalue = hex ${decvalue.toRadixString(16)} = oct ${decvalue.toRadixString(8)} = bin ${decvalue.toRadixString(2)}');

  // symbols - Used very rarely, for example in reflection
  Symbol obj = new Symbol('name'); 
  obj = #name;
}