Code generation

Code generation

var codes = [];
var charsNumber = '437'.split('');
var charsString = 'CKX'.split('');
var getCharRndString = function(){
  return charsString[ Math.floor(Math.random()* charsString.length) ];
}

var getCharRndNumber = function(){
  return charsNumber[ Math.floor(Math.random()*charsNumber.length) ];
}

for(var i = 0; i < 10000; i++){
  
  var code = [];
  var charStringCount = 0;

  while(code.length < 8){
    if(Math.random() < .4 && charStringCount < 2){
      charStringCount++;
      code.push(getCharRndString());
    } else {
      code.push(getCharRndNumber());
    }
    
  }  
  
  var codeString = code.join('');
  if(codes.indexOf(codeString)==-1){
    codes.push(codeString);
  }
}
console.log(codes.join('\n'));