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const person = { name: 'John', age: 30 };

for (const property in person) {
  console.log(`${property}: ${person[property]}`);
}

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2. Object.keys()

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const keys = Object.keys(person);

for (const key of keys) {
  console.log(`${key}: ${person[key]}`);
}

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3. Object.values()

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const values = Object.values(person);

for (const value of values) {
  console.log(value);
}

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4. Object.entries()

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const entries = Object.entries(person);

for (const [key, value] of entries) {
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}

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person.forEach((value, key) => {
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});

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