A random number between 1 and 4 that's not another random number

Question

For some reason the following code doesn\'t work.

var a1 = Math.floor(Math.random()*4+1); 

//Answer2
for(a2 = 0; a2 != a1 && a2 != 0; a2 = Math.floo         


        

Answer 1

Just add one if the number is greater than or equal to the one you want to exclude:

var a2 = Math.floor(Math.random() * 3 + 1);

if(a2 >= a1) {
    a2++;
}