JSFiddle - React, Tailwind, and code Playground

JavaScript

var array_old = [{id: "5436",title: "I Like you boy"},{id: "5437",title: "Hello how are you"},{id: "5438",title: "Hello how are you2"}];
var array_new = [{id: "5436",title: "I Like you boy"},{id: "1132",title: "I'm fine"}];

$.each(array_old, function(id, array){
    
    found = 0;
    
    $.each(array_new, function(id2, array2) {
               
        if(array['id']==array2['id'])
        {
            found++;
        }

    });
    
    if(found==0)
    {
        alert(array['id']+' does not exist in array_new');
    }
    
});