Implement a function pairs(array) that returns an object composed from key-value pairs.

• array: An array of arrays, where each inner array has exactly two elements: [key, value].

The function should return an object where the first element of each inner array becomes the key, and the second element becomes the value.

Example

pairs([['a', 1], ['b', 2]]); // { a: 1, b: 2 }
pairs([['name', 'Alice'], ['age', 25]]); // { name: 'Alice', age: 25 }
pairs([]); // {}