Javascript String truncate(length, truncation)

String.prototype.truncate = function(length, truncation) {
 length = length || 30;//w  w w.ja  v  a 2 s  .  c om
 truncation = truncation === undefined ? '...' : truncation;
 return this.length > length ?
  this.slice(0, length - truncation.length) + truncation : String(this);
};