javascript - How to get random elements from an array

Question

(This question already has answers here): question from:https://stackoverflow.com/questions/7158654/how-to-get-random-elements-from-an-array

Answer 1

You could shuffle the array and pick the first four.

numbers.sort( function() { return 0.5 - Math.random() } );

Now numbers[0], numbers[1]... and so on have random and unique elements.

Note that this method may not be an optimal way to shuffle an array: see Is it correct to use JavaScript Array.sort() method for shuffling? for discussion.