remove value from comma separated values string

Question

I have a csv string like this \"1,2,3\" and want to be able to remove a desired value from it.

For example if I want to remove the value: 2, the output string should

Answer 1

or

var csv_remove_val = function(s, val, sep) { 
  var sep = sep || ",", a = s.split(sep), val = ""+val, pos;
  while ((pos = a.indexOf(val)) >= 0) a.splice(pos, 1);
  return a.join(sep);
}