for fo loop code example

Example 1: Iterate with JavaScript For Loops

var myArray = [];
for (var i = 1; i <= 5; i++){
    myArray.push(i);
} 
console.log(myArray) // console output [ 1, 2, 3, 4, 5 ]

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;
  }
}