primes-game-4.html

<script>
  var prime = 2;
  var answer;
  var next;

  function isPrime(number) {
    var count;

    // Prime must be whole number greater than 1
    if (number < 2 || number % 1 != 0) {
      return false;
    }

    // Check whether number divisible by other than 1 or itself
    for(count = 2; count < number; count++)
      if (number % count == 0) {
        return false;
      }

    return true;
  }

  console.log('The prime numbers are:');

  while (true) {

    // Ask user for prime number until user guesses correctly
    do {

      if (prime == 2) {
        answer = prompt('What is the first prime number?');
      } else {
        answer = prompt('What is the next prime number?')
      }

      if (answer == '') break;

    } while (answer != prime);

    if (answer == '') break;
 
    console.log(prime);

    // Compute next prime number
    do {
      prime++      
    } while (!isPrime(prime));

  }
</script>