JSFiddle - React, Tailwind, and code Playground

HTML

<p>

    Numbers
    <span>
    </span>

</p>

CSS

p{
    color:#ddd;
}
span{
    color:red;
}

JavaScript

var arr = [ 1,1,1,1,1,1,1,1,3,3,3,3,3,3,4,4,4,4];
 
 
function eliminateDuplicates(arr) {
  var i,
      len=arr.length,
      out=[],
      obj={};
 
  for (i=0;i<len;i++) {
    obj[arr[i]]=0;
  }
  for (i in obj) {
    out.push(i);
  }
  return out;
}
b= eliminateDuplicates(arr)
$( "p>span" ).text( b.join( ", " ) );