Return the difference between two JavaScript objects (shallow compare)

shallowDelta_object_diff.js

shallowDelta(newObj, oldObj){
    if (Object.keys(oldObj).length == 0 
        && Object.keys(newObj).length > 0)
        return newObj;
    let diff = {};
    for (const key in oldObj) {
        if (newObj[key] && oldObj[key] != newObj[key] ) {
            diff[key] = newObj[key]; 
        }
    }
    if (Object.keys(diff).length > 0) return diff;
    return oldObj;
}