Toán tử logic (Logical Operators) trong Dart

var age = 25;
var hasLicense = true;
 
if (age >= 18 && hasLicense) {
  print('Can drive');
}

var isWeekend = true;
var isHoliday = false;
 
if (isWeekend || isHoliday) {
  print('Day off!');
}

var isRaining = false;
 
if (!isRaining) {
  print('Go outside');
}

var age = 25;
var hasLicense = true;
var hasInsurance = false;
 
if (age >= 18 && hasLicense && !hasInsurance) {
  print('Need insurance');
}

var result1 = false && expensiveCheck();  // Không gọi expensiveCheck()
var result2 = true || expensiveCheck();   // Không gọi expensiveCheck()