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let counter = 0;
let bool = false;

function intervalFunc() {
  console.log(counter);
  counter++;
  if(counter === 5) {
    bool = true;
    clearInterval(interval);
  }
}

let interval = setInterval(intervalFunc, 500);

console.log('after interval');
if(bool === true) {
  console.log('bool was true');
}