Flutter - Dart -流程控制 ifelse whil

if

  if (true) {
    print('maybe1');
  }

if else

 int a = 1;
  String b = ' ';
  if (a == 1) {
    b = 'maybe2';
  } else {
    b = 'maybe3';
  }
  print(b);

for

 for (var i = 0; i < 10; i++) {
    print(i);
    if (i == 1) {
      break;
    }
    if (i == 2) {
      continue;
    }
 }

while

int day = 0;
  while (day < 7) {
    print(day);
    day++;
    if (day == 2) {
      break;
    }
    if (day == 4) {
      continue;
    }
  }

do while

 int time = 0;
    do {
      print(time);
      time++;
      if (time == 3) {
        break;
      }
      if (time == 5) {
        continue;
      }
    } while (time < 7);

switch

 String date = 'Mon';

    switch (date) {
      case 'Mon':
        print(date);
        break;
      case 'Tus':
        print(date);
      break; 
      case 'Wes':
      case 'Thr':
      case 'Fti':
      print(date);
      break;
      default:
      print(date);
    }