If and else

Dart supports if statements with optional else statements, as thenext sample shows. Also see conditional expressions.

if (isRaining()) {
  you.bringRainCoat();
} else if (isSnowing()) {
  you.wearJacket();
} else {
  car.putTopDown();
}

Unlike JavaScript, conditions must use boolean values, nothing else. SeeBooleans for more information.