How can I go about refactoring this so that the duplicate code is eliminated?

  public executeOrdersHelper(order: Order){     var currentMarketPrice: number = this.marketData.get(order.symbol);     var randomQuantity: number = getRandomInt(30);     var fillAmount = Math.min(order.quantity - order.filledQuantity, randomQuantity);     var priceTotalForSymbol = this.marketStatistics.get([order.symbol, order.side]);  if(order.side == "BUY"){   if(order.price > currentMarketPrice){     order.filledQuantity+= fillAmount;     this.notifications.push(`Executing Order: Symbol: $  {order.symbol} Side: $  {order.side} Fill Amount: $  {fillAmount}`);     this.marketStatistics.set([order.symbol, order.side], priceTotalForSymbol + currentMarketPrice);     order.status = order.filledQuantity < order.quantity ? "PARTIALLY FILLED" : "FILLED";     this.marketData.set(order.symbol, currentMarketPrice + getRandomPrice());   } } else{   if(order.price <= currentMarketPrice){     order.filledQuantity+= fillAmount;     this.notifications.push(`Executing Order: Symbol: $  {order.symbol} Side: $  {order.side} Fill Amount: $  {fillAmount}`);     this.marketStatistics.set([order.symbol, order.side], priceTotalForSymbol + currentMarketPrice);     order.status = order.filledQuantity < order.quantity ? "PARTIALLY FILLED" : "FILLED";     this.marketData.set(order.symbol, currentMarketPrice - getRandomPrice());   } } 

I’m a little confused on how to go about doing this as the logic is slightly different in the if and else case