Loops

Relax. We'll talk through this in plain words — no textbook voice.

A loop runs a piece of code over and over. It's essential for displaying data from a List, calculating totals, and doing search/filter operations.

dart

void main() {
  List<int> prices = [3000, 5000, 7000];
  int total = 0;

  for (final price in prices) {
    total += price;
  }

  print('Total: $total');

  int count = 1;
  while (count <= 3) {
    print('Attempt $count');
    count++;
  }
}

for-in loop grabs each price in the List and adds it into total. while loop keeps running as long as the condition holds, and count++ bumps count up by 1.

You should see

Total: 15000 Attempt 1 Attempt 2 Attempt 3

Easy traps

Forget to increment the count in a while loop and you'll end up with an infinite loop. That's like putting your computer on a treadmill with no off button — don't do it.