how do I compare list of objects in two arrays in Jscript?

I have a task 

where arr1 has all the objects with all the attributes in it , now arr 2 has all the objects from arr1 and + one additional one

Now I have to pick all the objects from arr2[i] and look into arr1 and get the objects and its all attributes from the one which is not in arr1.

Following is the sample code for the same

var arr1 = Page.QuerySelectorAll(.category-container).toArray();

//add new category
var add_category_link = Page.QuerySelector('[data-internal-id="open_category_modal"]').Click();
Page.Wait();

//Select Language
var Sel_Lang=Page.QuerySelector('#lang_selector').ClickItem("English");

//enter Category Name
var Category_Name= Page.QuerySelector('[data-internal-id="category_name_en"]').SetText("dsgfdsgg");

//Click Save
var Add_Product_Save= Page.QuerySelector('#save_category_button').Click();
Page.Wait();

var arr2 = Page.QuerySelectorAll(.category-container).toArray();

var arr2_len = arr2.length;
var arr1_len= arr1.length;

//compare two arrays
if (arr1_len == arr2_len)
{
Log.Message("nothing happens");

}
else
{ Log.Message("length not same");

var i=0,j=0,len;
var result;
for (i = 0;i<arr2_len; i++)
{
var category_1= arr2[i];
var attribute_1=category_1.getAttribute(attrib);
var flag_check = false;
j = 0;
for (j=0; j<arr1_len;j++)
{
var category_2= arr1[j];
var attribute_2=category_2.getAttribute(attrib);

if (attribute_1==attribute_2)
{
Log.Message("Match found");
flag_check=true;
break;
}

}

if (flag_check)
{
return category_1;
}

}

return null;

}