Javascript Array toSentence()

// Array Extensions

Array.prototype.toSentence = function() {
 var options = Object.extend({ 
  "connector": "and", 
  "skip_last_comma": false 
 }, arguments[0] || {});//w  w w.java2 s  .co  m
 
 switch (this.length) {
  case 0:  return "";
  case 1:  return this.first().toString();
  case 2:  return this[0] + " " + options.connector + " " + this[1];
  default: return this.slice(0, -1).join(', ') + (options.skip_last_comma ? ' ' : ', ') + options.connector + " " + this[this.length-1];
 }
};