// return a number with commas
function numberWithCommas(x) {
    return x = x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
}

// debounce function
function debounce(func, wait = 20, immediate = true) {
      var timeout;
      return function() {
        var context = this, args = arguments;
        var later = function() {
          timeout = null;
          if (!immediate) func.apply(context, args);
        };
        var callNow = immediate && !timeout;
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);
        if (callNow) func.apply(context, args);
      };
    }