Gift card number generator

by kshep92

JavaScript

(function() {
	var alphabet  ="ABCDEGHIJLKMNOPQRSTUVWXYZ0123456789";
  var code = "GXP-";
  while(code.length <= 12) {
  	var idx = Math.floor(Math.random(alphabet.length - 1) * 10);
    code += alphabet[idx];
  }
  console.log(code); //n = 36, r = 12, perms = 5.9955562098432E+17 http://stattrek.com/online-calculator/combinations-permutations.aspx
})();