jQuery rails-like methods for string manip

gistfile1.txt

$.truncate = function(text, length) {
  if ( length === undefined ) length = 255;
  if ( text.length <= length ) return text;
  return text.substring(0, length) + '...';
};

$.number_with_delimiter = function(number, delimiter) {
  var part, new_number = [];
  if ( delimiter === undefined ) delimiter = ',';
  number = number.toString().split('').reverse();
  while( (part = number.splice(0, 3)) && number.length ) {
    new_number.push(part.reverse().join(''));
  }
  new_number.push(part.reverse().join(''));
  return  new_number.reverse().join(',');
};