JSFiddle - React, Tailwind, and code Playground

JavaScript

var Firstarray=["Mike","Jack"];
var SecondArray=["Mike","Jack","Andy","Cruz"];
var matchedData = [];


for (var i = 0; i < Firstarray.length; i++) {
                for (var j = 0; j < SecondArray.length; j++) {
                    if (Firstarray[i] == SecondArray[j]) {
                        matchedData.push(SecondArray[j]);
                        
                    }
                }
            }
            alert(matchedData);