Bijective encoding function in JavaScript for Base62

bijectiveEncode.js

// Simple port of a ruby bijective encode
// Ported from this Ruby example https://gist.github.com/1073996

function bijectiveEncode(i){
  var alphaNumArray = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".split('');

  if (i == 0){
    return alphaNumArray[0];
  }

  s = [];
  var base = alphaNumArray.length;
  
  while (i > 0){
    console.log(i);
    s.push(alphaNumArray[i % base]);
    i = Math.floor(i / base);
  }
  var enc = s.reverse();
  return enc.join('');
}

Thanks for posting. I found this, then I found this link that has the encode and decode together. https://github.com/delight-im/ShortURL/blob/master/JavaScript/ShortURL.js