Find intersection from a string array using javascript

/ Development, Interview Questions, Javascript
const findIntersection = (strArr) => {
     let strArr1 =  strArr.join(",");
     let strArr2 = strArr1.replace(/\s+/g, "").split(',');
     let strArr3 = strArr2.filter((item, index) => strArr2.indexOf(item) != index);
     if ( strArr3.length === 0)
         return false;
     return strArr3.join(", ").replace(/\s+/g,'');
 }


 console.log(findIntersection(["1, 3, 4, 7, 13", "1, 2, 4, 13, 15"]));

 console.log(findIntersection(["2, 3, 4", "3"]));

 console.log(findIntersection(["1, 2, 3, 4, 5", "6, 7, 8, 9, 10"]));