interval and interval

let collections = [2, 3, 55, 66, 77]

let delayMs = 10; // 10 ms
let iterate = (i) => {
    setTimeout(() => {
        console.log(collections[i++], i);
        if (i >= collections.length) return;
        iterate(i);
    }, delayMs)
}

iterate(0)
timer = setInterval(() => iterate(0), 3000);