JavaScript generate random number except some values

Question

I\'m generating random numbers from 1 to 20 by calling generateRandom(). How can I exclude some values, say 8 and 15?

function generateRandom(mi         


        

Answer 1

One way, which will maintain the generator's statistical properties, is to generate a number in [1, 18]. Then apply, in this order:

1. If the number is 8 or more, add 1.

2. If the number is 15 or more, add 1.

I'd be reluctant to reject and re-sample as that can cause correlation plains to appear in linear congruential generators.