[Vlasenko Fedor]

Тогда так на колбеках

function one(callback) {
    setTimeout( function() {
        callback("First");
    }, Math.random() * 1000);
}
 
function two(callback) {
    setTimeout( function() {
        callback("Second");
    }, Math.random() * 500);
}
 
function three(callback) {
    setTimeout( function() {
        callback("Third");
    }, Math.random() * 100);
}
 
function runCallback(s) {
    console.log(s);
}

const stream = (log, ...queue) => queue.shift()(s => (log(s), queue.length && stream(log, ...queue)))
stream(runCallback, one, two, three)