This video Challenge: Use While Loops was last updated on May 3 2022
It’s time for your next challenge! Your challenge is to create a loop that counts down from ten and instead of zero, you should print out the words, “Blast Off!”. That’s right, we’re launching rockets from raywenderlich.com - pause the video and now and try it out.
How’d that challenge go for you. Hopefully, it wasn’t too bad. A little resistance will go a long way to make you a better developer. Lets start at the top. Open up a fresh DartPad. Start by creating a new counter variable. Set it to 10.
var counter = 10;
Now comes our while loop. This loop will run so long as the counter is greater than zero.
while (counter > 0) {
}
Next print out the counter then make sure to decrement it.
print(counter);
counter -= 1;
Finally after the loop, print out the text ‘Blast Off!’.
print('Blast Off!');
And that’s it - you have a countdown. Now run the app. We get a countdown followed by the words, Blast Off!.