'use strict';

let i = 1;
let interval = 3000;

function get(i) {
    return new Promise((resolve, reject) => {
        resolve('get: '+i);
    });
}

function loop () {
    get(i).then((result) => {
        console.log(result);
    });
    setTimeout(function () {
        i++;
        loop();
    }, interval)
}

loop();