JSFiddle - React, Tailwind, and code Playground

JavaScript

var x = ["AAA", "aaa", "bbb", "BBB"];

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

alert(unique(x));