while (looping over something) {
  if (cond1) {
    create @foo if cond1 is met
    do a bunch of things, and go to the next iteration in the loop
  } else {
    since cond1 is not met, don't create a new @foo
    but do something to @foo already declared in the prev iteration
    do other things, and go to the next iteration in the loop
  }
}