findDiffObjects

findDiffObjects.js

let findDiffObjects = (newObj, oldObj) => {
    let newObjSet = new Set(Object.keys(newObj));
    let oldObjSet = new Set(Object.keys(oldObj));

    let common = {};
    let added = {};
    let removed = {};
    
    newObjSet.forEach(key => {
        let value = newObj[key];
        let result = !oldObjSet.has(key);

        if(result) added[key] = value;

        // Попутно соберем общие элементы, которые есть и в старом и в новом массивах
        if (!result && newArrSet.has(key)) common[key] = value;
    });

    oldObjSet.forEach(key => {
        let value = oldObj[key];
        let result = !newObjSet.has(key);

        if(result) removed[key] = value;
    });

    return { added, removed, common };
}