rand5() - Weekly interview question from interview cake

rand5.js

/*
You have a function rand7() that generates a random integer from 1 to 7. 
Use it to write a function rand5() that generates a random integer from 1 to 5.
rand7() returns each integer with equal probability. 
rand5() must also return each integer with equal probability.
*/

function rand5(){
  var x = rand7();
  while(x > 5){
    x = rand7();
  }
  return x;
}