Ember js -- remove duplicates from an array

I am trying to clean up a validation script.

So if the file type uploaded is wrong -- like an image instead of a pdf. I need the alert to say -- Wrong file type uploaded, only pdf accepted.

https://jsfiddle.net/mf78otve/37/

so the validation string looks like this

"application/pdf, application/x-pdf, application/acrobat, applications/vnd.pdf, text/pdf, text/x-pdf"

but really need to clean it up -- pdf, x-pdf, vnd.pdf, pdf, x-pdf

then remove duplicates to then pdf, x-pdf, vnd.pdf

var validations = "application/pdf, application/x-pdf, application/acrobat, applications/vnd.pdf, text/pdf, text/x-pdf";

console.log("validations", validations);

var res = validations.split("/");
console.log("res", res);


var uniqueArray = function(arrArg) {
  return arrArg.filter(function(elem, pos,arr) {
    return arr.indexOf(elem) == pos;
  });
};


console.log(uniqueArray(res));