to_binary.js

function toBinaryNumber(number) {
  var returning = new Array;
  if (number % 2 != 0) {
    returning[0] = 1;
    number -= 1;
  }

  while (number > 0) {
    i = 1;
    while (Math.pow(2, i) <= number) {
      if (Math.pow(2, (i + 1)) > number) {
        returning[i] = 1;
        number -= (Math.pow(2, i));
        break;
      }
      i++;
    }
  }

  for (var j=0; j < returning.length; j++) {
    if (returning[j] == null) {
      returning[j] = "0";
    } else {
      returning[j] = returning[j].toString();
    }
  }

  return parseInt(returning.reverse().join(""));
}