Binance.OrderBook.new

You're seeing just the function new, go back to Binance.OrderBook module for more information.
Link to this function

new(map_or_kwlist, opts \\ [])

Specs

new(ExConstructor.map_or_kwlist(), Keyword.t()) :: %Binance.OrderBook{
  asks: term(),
  bids: term(),
  last_update_id: term()
}