Trying to run a loop for exactly one second, but the loop runs infinitely. why?

Question

i am changing the value of 'aa' after 1 second, but the loop continues to execute.

let aa = true;

setTimeout(function () {
  aa = false;
}, 1000);

for (; aa; ) {
  console.log('aaa');
}

Answer 1

Your approach doesn’t work for reasons explained by others. You can use something like this instead:

var started = Date.now();
while(Date.now() - started < 1000) {
  console.log("aaa");
};