javascript 5 random non duplicating integers from 0 - 20

Question

What's the best way to generate 5 random non duplicating integers from 0 - 20?

I'm thinking, use Math.random with floor, loop it 5 times, check for duplicates, if duplicate, random again.

What's your way?

Answer 1

You could generate an array of numbers from 0 to 20, shuffle it and take the first 5 elements of the resulting array.

Answer 2

late answer i know, but:

var a=[];
while(a.length <3) {
  var n = Math.round(Math.random() * 20);
  if (a.indexOf(n)==-1) a.push(n);
}

=> [14, 17, 19]