Помогите написать функцию, на jQuery

function hexFromRGB(r, g, b) {
  let hex = [
    r.toString(16),
    g.toString(16),
    b.toString(16)
  ];
  $.each(hex, function(nr, val) {
    if (val.length === 1) {
      hex[nr] = "0" + val;
    }
  });
  return hex.join("").toUpperCase();
}

function refreshSwatch() {
  let red = $("#red").slider("value"),
    green = $("#green").slider("value"),
    blue = $("#blue").slider("value"),
    hex = hexFromRGB(red, green, blue);
  $("#swatch").css("background-color", "#" + hex);
}
$(function() {
  $("#red, #green, #blue").slider({
    orientation: "horizontal",
    range: "min",
    max: 255,
    value: 127,
    slide: refreshSwatch,
    change: refreshSwatch
  });
  $("#red").slider("value", 255);
  $("#green").slider("value", 140);
  $("#blue").slider("value", 60);
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<div class="wrapper">
  <button>Color</button>
  <button>Background</button>
</div>

<div id="red"></div>
<div id="green"></div>
<div id="blue"></div>

<div id="swatch" class="ui-widget-content ui-corner-all">
  <p class="text">Lorem ipsum dolor sit amet consectetur adipisicing elit.</p>
</div>