Difference Between Two Objs

function objDiff(obj1, obj2) {
    if (obj1 == = obj2) return {};
    if (obj1 == = null || obj2 == = null) return[obj1, obj2];
    if (typeof obj1 != = 'object' || typeof obj2 != = 'object') return[obj1, obj2];
    if (Array.isArray(obj1) != = Array.isArray(obj2)) return[obj1, obj2];

    const returnObject = {};
    for (const key in obj1) {
        if (key in obj2) {
            const subDiff = objDiff(obj1[key], obj2[key]);
            if (Object.keys(subDiff).length > 0) {
                returnObject[key] = subDiff;
            }
        }
    }
    return returnObject;
}```