Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
function createQueue(){
  const queue = [];
  return{
    enqueue(item){
      queue.unshift(item);
    },

  }
}
</script>


<script id="jsbin-source-javascript" type="text/javascript">function createQueue(){
  const queue = [];
  return{
    enqueue(item){
      queue.unshift(item);
    },

  }
}</script></body>
</html>