Chuỗi ký tự (String) trong Dart

var name = 'Dart';
var greeting = "Hello";
 
// Multi-line
var multiLine = '''
Line 1
Line 2
''';
 
// Empty
var empty = '';
print(empty.isEmpty);  // true

var str = '  Dart Programming  ';
 
print(str.toUpperCase());      // "  DART PROGRAMMING  "
print(str.toLowerCase());      // "  dart programming  "
print(str.trim());             // "Dart Programming"
print(str.contains('Dart'));   // true
print(str.replaceAll('Dart', 'Flutter'));

var str = 'Dart';
 
print(str.length);       // 4
print(str.isEmpty);      // false
print(str.startsWith('D'));  // true
print(str.endsWith('t'));    // true
print(str.substring(0, 2));  // "Da"

var csv = 'a,b,c';
var parts = csv.split(',');  // ['a', 'b', 'c']