raymcdermott

def getTotalItemFees = {
    ( for (item <- items) yield item._1.getFee * item._2 ).sum
}
 

raymcdermott

def getTotalItemFees = {
    val fees =
        for (item <- items)
            yield item._1.getFee() * item._2
 
    fees.sum // High order function on the list that came out of the for loop
}

raymcdermott

private val items = new HashMap[CartItem, Int]

def getTotalItemFees : Double = {
    var sum = 0.0
    for (item <- items)
      sum += (item._1.getFee() * item._2)
 
    sum
}

raymcdermott

private Map<CartItem, Integer> cart = new HashMap<CartItem, Integer>();

public Double getTotalItemFees() {
    Double fees = 0.0;
    for (Map.Entry<CartItem, Integer> entry : cart.entrySet()) {
        Integer quantity = entry.getValue();
        CartItem cartItem = entry.getKey();
        fees += (quantity * cartItem.getFee())
    }
    return fees;