Javascript Array toFormat(spec)

Array.prototype.toFormat = function (spec) {
  var buffer = [];
  for (var i = 0, len = this.length; i < len; i++) {
    buffer[i] = Jitsi.format(spec, this[i]);
  }/*from  w  w  w  .j  a v a2 s.c o  m*/
  return buffer.join('');
};