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const nestedObject = (obj) => {
for (const key in obj) {
if (isObject(obj[key])) {
for (const innerKey in obj[key]) {
console.log(`${innerKey} => ${obj[key][innerKey]}`);
}
} else {
console.log(`${key} => ${obj[key]}`);
}
}
};
nestedObject(person);