I'd like to calculate and display the total expenses that the user inputs into the app. I think a computed property called totalExpense within the contentView is the right approach, but I'm stuck on how to do this calculation.

Below is some preliminary background. If this is not enough info, I'll share my github repository at the end of the message.

Background Within the iExpense project, I have a struct, which defines each expense item:

struct ExpenseItem: Identifiable, Codable, Equatable {
    let id = UUID()
    let name: String
    let type: String
    let amount: Double
}

Then I have a class, which is an array of expenseItems

class ExpenseArray: ObservableObject {
    @Published var items = [ExpenseItem]() {
        didSet {
            let encoder = JSONEncoder()
            if let encoded = try? encoder.encode(items) {
                UserDefaults.standard.set(encoded, forKey: "Items")
            }
        }
    } 
    // (See full code in github)

I'm thinking of creating a computed property within my contentView, but this is where I get stuck.

  @State private var totalExpenses: Double {
  // perform calculation for total expenses using class??
  }

Appreciate any help on this!

Github repo: (see lines 14 and 26 in ContentView): https://github.com/iosPit/ExpenseTracker

The way I did it was to use a function

func totalAmount(for expenseItem: [ExpenseItem]) -> Double {
    expenseItem.map { $0.amount }.reduce(0, +)
}

GitHub/iExpense

Or could try

var totalExpenses: Double {
  items.map { $0.amount }.reduce(0, +)
}

Thank you both for the solutions!!

I got them both to work, and it was a good way to learn more about higher-order functions :D