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];
 
 var result = [];
     $.each(arr, function(i, e) {
      if ($.inArray(e, result) == -1) result.push(e);
     });
     alert(result);