Compare two key:value arrays and list differences

compare.js

function compareSelectedKeysWithValues(object1, object2, keysToCompare) {
    const result = {};

    keysToCompare.forEach(key => {
        const arr1 = object1[key] || [];
        const arr2 = object2[key] || [];

        const added = arr2.filter(item2 => !arr1.some(item1 => Object.keys(item1)[0] === Object.keys(item2)[0]));
        const deleted = arr1.filter(item1 => !arr2.some(item2 => Object.keys(item2)[0] === Object.keys(item1)[0]));
        const modified = arr1.filter(item1 =>
            arr2.some(item2 =>
                Object.keys(item1)[0] === Object.keys(item2)[0] && item1[Object.keys(item1)[0]] !== item2[Object.keys(item2)[0]]
            )
        ).map(item1 => {
            const item2 = arr2.find(item2 => Object.keys(item1)[0] === Object.keys(item2)[0]);
            return { old: { [Object.keys(item1)[0]]: item1[Object.keys(item1)[0]] }, new: { [Object.keys(item2)[0]]: item2[Object.keys(item2)[0]] } };
        });

        result[key] = {
            added,
            deleted,
            modified
        };
    });

    return result;
}

// Example objects
const oldObject = {
    EDUCATION: [
        { A: 'Apple' },
        { B: 'Bear' }
    ],
    SCHOOL: [
        { C: 'cat' },
        { D: 'dat' }
    ]
};

const newObject = {
    EDUCATION: [
        { A: 'Apple' },
        { B: 'Bird' }
    ],
    SCHOOL: [
        { C: 'cat' },
        { D: 'dot' }
    ]
};

const keysToCompare = ['EDUCATION', 'SCHOOL'];

const comparisonResult = compareSelectedKeysWithValues(oldObject, newObject, keysToCompare);
console.log(comparisonResult);