for loops MDN code example

Example 1: forloop in js

for(i = 0; i < x; ++i){
  //Loop, x can be replaced with any integer; 
}

Example 2: mdn for..of

function* fibonacci() { // a generator function
  let [prev, curr] = [0, 1];
  while (true) {
    [prev, curr] = [curr, prev + curr];
    yield curr;
  }
}

for (const n of fibonacci()) {
  console.log(n);
  // truncate the sequence at 1000
  if (n >= 1000) {
    break;
  }
}