JSFiddle - React, Tailwind, and code Playground

JavaScript

$(document).ready(function(){
     var arr1=["a","b","b","c","c","d"];
var arr2=[];   
     
     $.each(arr1, function(i,             el){
            if($.inArray(el, arr2) === -1) 
                arr2.push(el);
        });
     alert(arr2);
      });