flutter中dart语言基础二：条件语句

if else

int a = 2;
 int b = 3;
 if (a < b) {
   print("$a is smaller");
 } else {
   print("$b is smaller");
 }

三元运算符

  a > b ? print('a大于b') : print('a小于b');

??表达式

String name = "test";
 String nameToPrint = name ?? '[email protected]';
 print(nameToPrint);

switch 语句

String grade = 'A';
  switch (grade) {
    case 'A':
      print('very good');
      break;
    case 'B':
      print('b');
      break;
    default:
      print('其他');
  }