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`Object.entries()` is a built-in JavaScript method
that **returns an array of pairs** `[key, value]` for all *own* (non-inherited) enumerable properties of an object.

---

### Syntax

```javascript
Object.entries(obj)
```

- `obj` - the object whose properties need to be converted into pairs.
- Returns an **array of arrays**, where each inner array is `[key, value]`.

---

### Example

```javascript
const user = {
  name: 'Tim',
  age: 25,
  city: 'Berlin'
};

console.log(Object.entries(user));
```

Result:

```javascript
[
  ['name', 'Tim'],
  ['age', 25],
  ['city', 'Berlin']
]
```

Each `[key, value]` pair is an element of the resulting array.

---

### Features

1. Returns **only own** properties:

```javascript
  const base = { type: 'human' };
  const user = Object.create(base);
  user.name = 'Tim';

console.log(Object.entries(user)); // [['name', 'Tim']]
  ```
2. Returns **only enumerable** properties (`enumerable: true`):

```javascript
  const obj = {};
  Object.defineProperty(obj, 'hidden', { value: 42, enumerable: false });
  obj.visible = 10;

console.log(Object.entries(obj)); // [['visible', 10]]
  ```
3. The order matches `Object.keys()` and `Object.values()`.

---

### Often used to iterate over an object

```javascript
const user = { name: 'Tim', age: 25 };

for (const [key, value] of Object.entries(user)) {
  console.log(`${key}: ${value}`);
}
```

Will print:

```javascript
name: Tim
age: 25
```

---

### Example: converting an object to a Map

```javascript
const user = { name: 'Tim', age: 25 };
const userMap = new Map(Object.entries(user));

console.log(userMap.get('age')); // 25
```

`Object.entries()` is convenient for converting between `Object` and `Map`.

---

### Example of the reverse conversion (from pairs back to an object)

```javascript
const entries = [
  ['name', 'Tim'],
  ['age', 25]
];

const user = Object.fromEntries(entries);
console.log(user); // { name: 'Tim', age: 25 }
```

---

### SUMMARY

| Method | What it returns | Considers the prototype | Data type |
|---|---|---|---|
| `Object.keys(obj)` | array of keys | No | `Array<string>` |
| `Object.values(obj)` | array of values | No | `Array<any>` |
| `Object.entries(obj)` | array of `[key, value]` pairs | No | `Array<[string, any]>` |

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