Picking 2 random elements from array

Question

What is the most efficient way to select 2 unique random elements from an array (ie, make sure the same element is not selected twice).

I have so far:

Answer 1

It can be done using built-in functionality (slice and sort),

var n = 2
    randomItems = array.sort(() => .5 - Math.random()).slice(0, n);

Answer 2

If you want to get n random elements you could create a shuffled version of your list and then return the first n elements of the shuffled array as a result.

Answer 3

You can do something easy like this

const elements = ['indie hackers', 'twitter', 'product hunt', 'linkedIn'];
const randomIndex = Math.floor(Math.random() * elements.length);
const a = elements[randomIndex];

const filteredElements = [...elements].splice(randomIndex, 1);
const b = filteredElements[Math.floor(Math.random() * elements.length)];

a and b will be your random elements.