Write a foreach function that can traverse arrays and objects

The Foreach function iterates through the array:

var arr = [];arr.foreach(function  (item, index) {    console.log (Index,item)}) 

The foreach function iterates over the object:

var obj = {        $, $,    +}var  key;  for inch obj) {    if  (Obj.hasownproperty (key)) {        console.log (Key,obj[key])    }}

A foreach function that can traverse both

functionForEach (obj, fn) {varkey; if(objinstanceofArray) {Obj.foreach (function(item, index) {fn (Item,index)})} Else {         for(Keyinchobj) {            if(Obj.hasownproperty (key)) {FN (key, Obj[key]) }}}}vararr = [1, 2, 3];varobj ={x:100, y:200, Z:300}foreach (arr,function(item, index) {console.log (Index,item)}) ForEach (obj,function(Key, Val) {Console.log (Key, Val)})

Write a foreach function that can traverse arrays and objects