Gets an array values consistently, read them and resolve with results (this is a basic example that was done to understand how I can read array, make an ajax call with value and resolve for getting next one). The values are printing in arow.

promise-sequence.js

'use strict';

//The sandbox http://jsbin.com/leraku/edit?js,console

let mas = [1, 2, 3];

let prom = function (value) {
  return new Promise(resolve => {
    setTimeout(() => {
       console.log(value);
      resolve();
    }, 400);
  });
}

let seq = function (arr) {
  let ind = 0;
  
  function next () {
    if (ind < arr.length) {
      prom(arr[ind++])
        .then(next);
    }  
  }
  
  next();
}

seq(mas);