Alex Piglatin

piglatin.js

var assert = require('assert');

function pigLatin(input)
{
  var result = input;

  result = result.replace(/(\w+)/g, function(match)
  {
    var firstChar = match.charAt(0),
        firstCharCode = firstChar.charCodeAt(0),
        rest = match.substr(1)
        ;

    if(firstCharCode >= 65 && firstCharCode < 97)
      rest = rest.charAt(0).toUpperCase() + rest.substr(1);

    return rest + firstChar.toLowerCase() + 'ay';
  });

  return result;
}

assert.equal(pigLatin('hello'), 'ellohay');
assert.equal(pigLatin('hello world'), 'ellohay orldway');
assert.equal(pigLatin('Hello World'), 'Ellohay Orldway');