Array difference

var Fruit = ["Apple", "Kinnow", "Mango", "Orange"];
var Citrus = ["Lemon", "Kinnow", "Orange", "Tangerine"];

function diffArrays (A, B) {
  var strA = ":" + A.join("::") + ":";
  var strB = ":" +  B.join(":|:") + ":";

  var reg = new RegExp("(" + strB + ")","gi");
  var strDiff = strA.replace(reg,"").replace(/^:/,"").replace(/:$/,"");

  var arrDiff = strDiff.split("::");
  return arrDiff;
}