Simple JS function for performing functions in a timed queue.

interval-queue.js

function iq(ms, f, q) {
  q = q || [];
  var timer = null;
  function drain() {
    var p = q.shift();
    if (p) {
      f ? f(p) : p();
    } else {
      clearInterval(timer);
      timer = null;
    }
  }

  return function (item) {
    if (item) q.push(item);
    if (!timer) {
      timer = setInterval(drain, ms);
      drain();
    }
  }
};