Types of orders

1. Market Order:
   Matches best available price

2. Limit Order:
   Buy Limit Order: An Order at a price n or lower
   Sell Limit Order: An order at a price n or higher

Order

orderType: Enum (Market | Limit) price: double quantity: double

Order book

Maintains:

• A list of bids
• A list of asks
• A list of transactions
• last traded price
• market spread value
• ability to notify when the order is matched

Functionality

Orderbook should be able to accept new Orders Orderbook should be able to update existing Orders Orderbook should be able to delete existing Orders ! Will we require a unique identifier (ID) for finding orders? Received order should be added to the orderbook maintained in the memory

Data structure

Asks Map { price: {quantity}, price: {quantity}, price: {quantity}, price: {quantity}, } Bids Map { price: {quantity}, price: {quantity}, price: {quantity}, price: {quantity}, }