let works = [];
function tick() {
    for (const work of works) {
        work();
    }
}
// add a work to the eventloop
function enqueueWork(work) {
    works.push(work);
}
// remove a work form the eventloop
function dequeueWork(w) {
    works = works.filter(o => o!==work);
}

function setTimeout(f, t) {
    const createdAt = Date.now();
    enqueueWork(function work() {
        if (createdAt + t < Date.now()) {
            dequeueWork(work);
            f();
        }
    });
}


function generateMessage(cb) {
  setTimeout(() => {
    cb('hello world!');
  }, 1000);
}

function msg() {
    generateMessage((msg) => {
        console.log('Message: ', msg);
    });
}

msg();

while (true) {
    tick();
}