setTimeout(() => {
  console.log("timeout1");
}, 0);
function toto() {
  Promise.resolve().then(() => {
    console.log("promise2");
  });
}
function titi() {
  console.log(7);
}

Promise.resolve().then(() => {
  console.log("promise1");
});
console.log(4);
toto();
console.log(5);
titi();
Promise.resolve().then(() => {
  console.log("promise3");
});
console.log(6);