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

I've read through all these answers and they differ a lot in philosophy, so I thought I might add my very own 2 bits, despite of this question having an answer, because I do think there is a better and more elegant way of approaching this problem.

We can make a function that takes min, max and blacklist as parameters and outputs a random result without using recursion (and with close to 0 if statements):

const blrand = function(min, max, blacklist) { if(!blacklist) blacklist = [] let rand = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min; let retv = 0; while(blacklist.indexOf(retv = rand(min,max)) > -1) { } return retv; }

usage: let randomNumber = blrand(0, 20, [8, 15]);