How to get n random keys from a JavaScript object

Let's suppose the following object:

javascript
let ceos = {
    
    'bill': 1955,
    'elon': 1971,
    'jeff': 1964,
    'erik': 1990
    
}

If you want to get n random keys of the object:

javascript
// Defining the number of random keys
let n = 2;

// Shuffling the object
let shuffle = Object.keys(ceos).map((e, i, a) => {
    
    // Getting a random value between [i, a.length]
    // Math.floor can be translated as ~~
    let j = Math.floor(Math.random() * (a.length - i) + i);
    
    // Switching the elements of positions i & j
    [a[i], a[j]] = [a[j], a[i]];
    
    // Returning current value
    return a[i];
    
});

// Getting random keys
let randomKeys = shuffle.slice(0, n);

console.log(randomKeys);
// ['elon', 'jeff']

In one line of code:

javascript
let randomKeys = Object.keys(ceos).map((e, i, a, j = ~~(Math.random() * (a.length - i) + i)) => ([a[i], a[j]] = [a[j], a[i]], a[i])).slice(0, 2);

console.log(randomKeys);
// ['erik', 'elon']