code: function longest() {
    var args = slice.call(arguments)
      , len = 0, resp, arg
    for (var i = 0; i < args.length; i++) {
      arg = args[i]
      if (arg.length >= len) {
        len = arg.length
        resp = arg
      }
    }
    return resp
  }
docs: Utility: Find the longest array or string in argument list
  
  @param {...} arrays or strings to check
  @return {Array} longest array
  @api private