Control Flow

For Loop

Accumulating a Total

A C-style for (init; cond; step) runs the body until the condition is false. += updates accumulator state.

Program

Play the program to sum the numbers 1 through 3.

for_loop.dart 
void main() {
  var total = 0;
  for (var i = 1; i <= 3; i++) {
    total += i;
  }
  print(total);
}
for `for (init; cond; step)` is the classic counted loop.
++ and += `i++` post-increments; `total += i` adds in place.
accumulator `total` carries state across iterations.