missileManager.js

function launchAll(missiles, launchMissile) {
  for(var i = 0; i < 5; i++) {
    setTimeout(function() {
      launchMissile(i);
    }, i * 1000);
  }
}


// [1, 2, 3, 4, 5]
launchAll([1, 2, 3, 4, 5], (missile) => {
  console.log(`Launch missile #${missile}`);
});